Refine setup for VSCode users

This primarily ensures that people automatically remove trailing
whitespaces for Fluent files, which fail the linter.

Additionally, it adds two relevant recommended extensions, and
aligned settings for different languages.

.vscode/extensions.json

@@ -8,6 +8,8 @@
 		"stylelint.vscode-stylelint",
 		"esbenp.prettier-vscode",
 		"eamodio.gitlens",
+		"Orta.vscode-jest",
+		"macabeus.vscode-fluent",
 	],
 	// List of extensions recommended by VS Code that should not be recommended for users of this workspace.
 	"unwantedRecommendations": []

.vscode/settings.json

@@ -7,36 +7,24 @@
     "eslint.validate": [
         "javascript"
     ],
-    "[javascript]": {
-        "editor.defaultFormatter": "esbenp.prettier-vscode",
-        "editor.codeActionsOnSave": {
-            "source.fixAll.eslint": true
-        }
-    },
-    "[typescript]": {
-        "editor.defaultFormatter": "esbenp.prettier-vscode",
-        "editor.codeActionsOnSave": {
-            "source.fixAll.eslint": true
-        }
-    },
-    "[typescriptreact]": {
-        "editor.defaultFormatter": "esbenp.prettier-vscode",
-        "editor.codeActionsOnSave": {
-            "source.fixAll.eslint": true
-        }
-    },
-    "[css]": {
-        "editor.codeActionsOnSave": {
-            "source.fixAll.stylelint": "explicit"
-        }
-    },
     "gitlens.advanced.blame.customArguments": [
         "--ignore-revs-file",
         ".git-blame-ignore-revs"
     ],
+    "[css][scss]": {
+        "editor.codeActionsOnSave": {
+            "source.fixAll.stylelint": "explicit"
+        }
+    },
     "[javascript][typescript][typescriptreact]": {
         "editor.codeActionsOnSave": {
             "source.fixAll.eslint": "explicit"
         }
     },
+    "[javascript][typescript][typescriptreact][markdown][html][css][scss]": {
+        "editor.defaultFormatter": "esbenp.prettier-vscode",
+    },
+  "[fluent]": {
+    "files.trimTrailingWhitespace": true
+  },
 }