Add md files for auto index pages

Part of IA and Redocly migration work. Create simple .md files to
represent the automatic index pages that previously only existed in
the dactyl-config.yml file. (The code used to do this is also part
of the commit but is, hopefully, no longer needed.)

content/references/http-websocket-apis/admin-api-methods/key-generation-methods/index.md

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+---
+html: key-generation-methods.html
+parent: admin-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Key Generation Methods
+Use these methods to generate and manage keys.

content/references/http-websocket-apis/admin-api-methods/logging-and-data-management-methods/index.md

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+---
+html: logging-and-data-management-methods.html
+parent: admin-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Logging and Data Management Methods
+Use these methods to manage log levels and other data, such as ledgers.

content/references/http-websocket-apis/admin-api-methods/peer-management-methods/index.md

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+---
+html: peer-management-methods.html
+parent: admin-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Peer Management Methods
+Use these methods to manage your server's peer-to-peer connections.

content/references/http-websocket-apis/admin-api-methods/server-control-methods/index.md

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+---
+html: server-control-methods.html
+parent: admin-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Server Control Methods
+Use these methods to manage the rippled server.

content/references/http-websocket-apis/admin-api-methods/signing-methods/index.md

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+---
+html: signing-methods.html
+parent: admin-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Signing Methods
+Use these methods to work with transactions.

content/references/http-websocket-apis/admin-api-methods/status-and-debugging-methods/index.md

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+---
+html: status-and-debugging-methods.html
+parent: admin-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Status and Debugging Methods
+Use these methods to check the status of the network and server.

content/references/http-websocket-apis/index.md

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+---
+html: http-websocket-apis.html
+parent: references.html
+template: pagetype-category.html.jinja
+---
+# HTTP / WebSocket APIs
+Communicate directly with rippled, the core peer-to-peer server that manages the XRP Ledger.

content/references/http-websocket-apis/peer-port-methods/index.md

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+---
+html: peer-port-methods.html
+parent: http-websocket-apis.html
+template: pagetype-category.html.jinja
+---
+# Peer Port Methods
+Special API method for sharing network topology and status metrics.

content/references/http-websocket-apis/public-api-methods/account-methods/index.md

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+---
+html: account-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Account Methods
+An account in the XRP Ledger represents a holder of XRP and a sender of transactions. Use these methods to work with account info.

content/references/http-websocket-apis/public-api-methods/clio-server/index.md

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+---
+html: clio-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Clio Server
+Use these methods to retrieve information using Clio server APIs.

content/references/http-websocket-apis/public-api-methods/ledger-methods/index.md

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+---
+html: ledger-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Ledger Methods
+A ledger version contains a header, a transaction tree, and a state tree, which contain account settings, trustlines, balances, transactions, and other data. Use these methods to retrieve ledger info.

content/references/http-websocket-apis/public-api-methods/path-and-order-book-methods/index.md

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+---
+html: path-and-order-book-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Path and Order Book Methods
+Paths define a way for payments to flow through intermediary steps on their way from sender to receiver. Paths enable cross-currency payments by connecting sender and receiver through order books. Use these methods to work with paths and other books.

content/references/http-websocket-apis/public-api-methods/payment-channel-methods/index.md

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+---
+html: payment-channel-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Payment Channel Methods
+Payment channels are a tool for facilitating repeated, unidirectional payments, or temporary credit between two parties. Use these methods to work with payment channels.

content/references/http-websocket-apis/public-api-methods/server-info-methods/index.md

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+---
+html: server-info-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Server Info Methods
+Use these methods to retrieve information about the current state of the rippled server.

content/references/http-websocket-apis/public-api-methods/subscription-methods/index.md

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+---
+html: subscription-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Subscription Methods
+Use these methods to enable the server to push updates to your client when various events happen, so that you can know and react right away. WebSocket API only.

content/references/http-websocket-apis/public-api-methods/transaction-methods/index.md

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+---
+html: transaction-methods.html         # watch for clashes w/ this filename
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Transaction Methods
+Transactions are the only thing that can modify the shared state of the XRP Ledger. All business on the XRP Ledger takes the form of transactions. Use these methods to work with transactions.

content/references/http-websocket-apis/public-api-methods/utility-methods/index.md

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+---
+html: utility-methods.html
+parent: public-api-methods.html
+template: pagetype-category.html.jinja
+---
+# Utility Methods
+Use these methods to perform convenient tasks, such as ping and random number generation.