Mass-replace blurb with seo:description in frontmatter

content/references/http-websocket-apis/api-conventions/ctid.md

@@ -1,7 +1,8 @@
 ---
 html: ctid.html
 parent: api-conventions.html
-blurb: A Compact Transaction Identifier (CTID) is a short string that uniquely identifies a validated transaction across any chain.
+seo:
+    description: A Compact Transaction Identifier (CTID) is a short string that uniquely identifies a validated transaction across any chain.
 labels:
   - Development
 ---

content/references/http-websocket-apis/api-conventions/error-formatting.md

@@ -1,7 +1,8 @@
 ---
 html: error-formatting.html
 parent: api-conventions.html
-blurb: Error formats and common error codes for WebSocket, JSON-RPC, and Commandline interfaces.
+seo:
+    description: Error formats and common error codes for WebSocket, JSON-RPC, and Commandline interfaces.
 labels:
   - Development
 ---

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

@@ -1,7 +1,8 @@
 ---
 html: api-conventions.html
 parent: http-websocket-apis.html
-blurb: Common conventions used across the XRP Ledger's HTTP APIs.
+seo:
+    description: Common conventions used across the XRP Ledger's HTTP APIs.
 metadata:
   indexPage: true
 ---

content/references/http-websocket-apis/api-conventions/markers-and-pagination.md

@@ -1,7 +1,8 @@
 ---
 html: markers-and-pagination.html
 parent: api-conventions.html
-blurb: Convention for paginating large queries into multiple responses.
+seo:
+    description: Convention for paginating large queries into multiple responses.
 ---
 # Markers and Pagination
 

content/references/http-websocket-apis/api-conventions/rate-limiting.md

@@ -1,7 +1,8 @@
 ---
 html: rate-limiting.html
 parent: api-conventions.html
-blurb: Information on how public APIs limit clients from making too many requests.
+seo:
+    description: Information on how public APIs limit clients from making too many requests.
 labels:
   - Core Server
 ---

content/references/http-websocket-apis/api-conventions/request-formatting.md

@@ -1,7 +1,8 @@
 ---
 html: request-formatting.html
 parent: api-conventions.html
-blurb: Standard request format, with examples, for the WebSocket, JSON-RPC, and Commandline interfaces.
+seo:
+    description: Standard request format, with examples, for the WebSocket, JSON-RPC, and Commandline interfaces.
 ---
 # Request Formatting
 

content/references/http-websocket-apis/api-conventions/response-formatting.md

@@ -1,7 +1,8 @@
 ---
 html: response-formatting.html
 parent: api-conventions.html
-blurb: Standard response format, with examples, for the WebSocket, JSON-RPC, and Commandline interfaces.
+seo:
+    description: Standard response format, with examples, for the WebSocket, JSON-RPC, and Commandline interfaces.
 ---
 # Response Formatting
 

content/references/http-websocket-apis/api-conventions/rippled-server-states.md

@@ -1,7 +1,8 @@
 ---
 html: rippled-server-states.html
 parent: api-conventions.html
-blurb: Definitions of state information reported in some API methods.
+seo:
+    description: Definitions of state information reported in some API methods.
 labels:
   - Core Server
 ---