Emacs: Complete restructure of the config

Changed
- Org-mode babel config to separate .el modules
- Built-in package manager package.el to Elpaca
- Configuration macro use-package to setup.el
- Completion framework selectrum to vertico

.config/emacs/snippets/c++-mode/namespace

@@ -4,6 +4,6 @@
 # --
 namespace ${1:Namespace} {
 
-	$0
+$0
 
 } // namespace $1