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/package/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "vscode-markdown-languageserver",
+  "description": "Markdown language server",
+  "version": "0.2.0-alpha.4",
+  "author": "Microsoft Corporation",
+  "license": "MIT",
+  "engines": {
+    "node": "*"
+  },
+  "main": "./out/node/main",
+  "browser": "./dist/browser/main",
+  "files": [
+    "dist/**/*.js",
+    "out/**/*.js"
+  ],
+  "dependencies": {
+    "vscode-languageserver": "^8.0.2",
+    "vscode-languageserver-textdocument": "^1.0.5",
+    "vscode-languageserver-types": "^3.17.1",
+    "vscode-markdown-languageservice": "^0.2.0-alpha.4",
+    "vscode-nls": "^5.2.0",
+    "vscode-uri": "^3.0.3"
+  },
+  "devDependencies": {
+    "@types/node": "16.x"
+  },
+  "scripts": {
+    "compile": "gulp compile-extension:markdown-language-features-server",
+    "prepublishOnly": "npm run compile",
+    "watch": "gulp watch-extension:markdown-language-features-server"
+  }
+}