Pick up latest markdown language service and clean up server package (#164516)

- Picks up newest markdown language service
- Excludes some files from server publish
- Delete unused file
- Update readme
- Align server version with LS version

extensions/markdown-language-features/server/README.md

@@ -34,7 +34,7 @@ This server uses the [Markdown Language Service](https://github.com/microsoft/vs
 	- Organize link definitions source action.
 	- Extract link to definition refactoring.
 
-- (experimental) Updating links when a file is moved / renamed. Uses a custom `markdown/getEditForFileRenames` message.
+- Updating links when a file is moved / renamed. Uses a custom `markdown/getEditForFileRenames` message.
 
 - [Pull diagnostics (validation)](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_pullDiagnostics) for links.
 
@@ -56,6 +56,10 @@ The server supports the following settings:
 	- `suggest`
 		- `paths`
 			- `enabled` — Enable/disable path suggestions.
+
+	- `occurrencesHighlight`
+		- `enabled` — Enable/disable highlighting of link occurrences.
+
 	- `validate`
 		- `enabled` — Enable/disable all validation.
 		- `referenceLinks`