Declare support for markdown files (#950)

Changes necessary to support markdown formatting in ruff's LSP in
vscode:
astral-sh/ruff#23063

Author: amyreese

package.json

@@ -56,8 +56,10 @@
   },
   "activationEvents": [
     "onLanguage:python",
+    "onLanguage:markdown",
     "workspaceContains:*.py",
-    "workspaceContains:*.ipynb"
+    "workspaceContains:*.ipynb",
+    "workspaceContains:*.md"
   ],
   "main": "./dist/extension.js",
   "scripts": {

src/common/utilities.ts

@@ -37,11 +37,13 @@ export async function getProjectRoot(): Promise<WorkspaceFolder> {
 
 export function getDocumentSelector(): DocumentSelector {
   return isVirtualWorkspace()
-    ? [{ language: "python" }]
+    ? [{ language: "python" }, { language: "markdown" }]
     : [
         { scheme: "file", language: "python" },
         { scheme: "untitled", language: "python" },
         { scheme: "vscode-notebook", language: "python" },
         { scheme: "vscode-notebook-cell", language: "python" },
+        { scheme: "file", language: "markdown" },
+        { scheme: "untitled", language: "markdown" },
       ];
 }