Re-levelization: move non-docs content, rename content→docs

For better URLs, the content folder has been renamed 'docs' and all
other files have been moved up a level. Also, non-docs images have been
moved to the static folder at the top level where they belong.

Many relative paths had to be fixed to make this work.

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

@@ -147,4 +147,4 @@ If the request specified `"owner_funds": true` and expanded transactions, the re
 * `lgrNotFound` - The ledger specified by the `ledger_hash` or `ledger_index` does not exist, or it does exist but the server does not have it.
 * `noPermission` - If you specified `full` or `accounts` as true, but are not connected to the server as an admin (usually, admin requires connecting on localhost).
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/ledger-methods/ledger_closed.md

@@ -107,4 +107,4 @@ The response follows the [standard format][], with a successful result containin
 
 * Any of the [universal error types][].
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/ledger-methods/ledger_current.md

@@ -107,4 +107,4 @@ A `ledger_hash` field is not provided, because the hash of the current ledger is
 
 * Any of the [universal error types][].
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/ledger-methods/ledger_data.md

@@ -15,7 +15,7 @@ The `ledger_data` method retrieves contents of the specified ledger. You can ite
 ## Request Format
 An example of the request format:
 
-{% raw-partial file="/_snippets/no-cli-syntax.md" /%}
+{% raw-partial file="/docs/_snippets/no-cli-syntax.md" /%}
 
 {% tabs %}
 
@@ -269,4 +269,4 @@ The format of each object in the `state` array depends on whether `binary` was s
 * `invalidParams` - One or more fields are specified incorrectly, or one or more required fields are missing.
 * `lgrNotFound` - The ledger specified by the `ledger_hash` or `ledger_index` does not exist, or it does exist but the server does not have it.
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}

docs/references/http-websocket-apis/public-api-methods/ledger-methods/ledger_entry.md

@@ -16,7 +16,7 @@ The `ledger_entry` method returns a single ledger entry from the XRP Ledger in i
 
 This method can retrieve several different types of data. You can select which type of item to retrieve by passing the appropriate parameters, comprised of the general and type-specific fields listed below, and following the standard [request formatting](../../api-conventions/request-formatting.md). (For example, a WebSocket request always has the `command` field and optionally an `id` field, and a JSON-RPC request uses the `method` and `params` fields.)
 
-{% raw-partial file="/_snippets/no-cli-syntax.md" /%}
+{% raw-partial file="/docs/_snippets/no-cli-syntax.md" /%}
 
 ### General Fields
 
@@ -802,4 +802,4 @@ An example of a successful response:
 * `malformedRequest` - The request provided an invalid combination of fields, or provided the wrong type for one or more fields.
 * `unknownOption` - The fields provided in the request did not match any of the expected request formats.
 
-{% raw-partial file="/_snippets/common-links.md" /%}
+{% raw-partial file="/docs/_snippets/common-links.md" /%}