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.json

@@ -1,7 +1,7 @@
 {
   "name": "vscode-markdown-languageserver",
   "description": "Markdown language server",
-  "version": "0.0.0-alpha-5",
+  "version": "0.2.0-alpha.4",
   "author": "Microsoft Corporation",
   "license": "MIT",
   "engines": {
@@ -9,11 +9,15 @@
   },
   "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.3",
+    "vscode-markdown-languageservice": "^0.2.0-alpha.4",
     "vscode-nls": "^5.2.0",
     "vscode-uri": "^3.0.3"
   },
@@ -22,6 +26,7 @@
   },
   "scripts": {
     "compile": "gulp compile-extension:markdown-language-features-server",
+    "prepublishOnly": "npm run compile",
     "watch": "gulp watch-extension:markdown-language-features-server"
   }
 }