Use built-in git instead of Git Automator extension

This commit updates the git instructions
To use the built-in VS Code git integration instead of Git Automator.

- Automatically stage all changes
  "git.enableSmartCommit": true,

- Automatically push & pull changes to the remote after committing
  "git.postCommitCommand": "sync"

Updates the settings in this project to dogfood the new defaults.

This feature could be improved further
By setting a default key-binding to Git: Commit All,
And/or by automatically committing on save or focus change
For the most SaaS-like experience.

Part of issue #30 along with a PR to foambubble/foam-template.

.vscode/extensions.json

@@ -11,10 +11,6 @@
     // GitLens for seeing version history inline
     "eamodio.gitlens",
 
-    // Git Automator for quick commit and push
-    // (Could be improved)
-    "ivangabriele.vscode-git-add-and-commit",
-
     // Tons of markdown goodies (lists, tables of content, so much more)
     "yzhang.markdown-all-in-one",
 

.vscode/settings.json

@@ -9,5 +9,7 @@
   "[markdown]": {
     "editor.quickSuggestions": true
   },
-  "cSpell.language": "en-GB"
+  "cSpell.language": "en-GB",
+  "git.enableSmartCommit": true,
+  "git.postCommitCommand": "sync"
 }