Moving all content_scripts-related components under $content directory

Having $lib/component with just $component was a bit confusing,
especially since $lib is also used in Svelte components all over the
place. This move will hopefully make it less confusing for me.

.vite/lib/content-scripts.js

@@ -51,6 +51,7 @@ function wrapScriptIntoIIFE() {
 function makeAliases(rootDir) {
   return {
     "$config": path.resolve(rootDir, 'src/config'),
+    "$content": path.resolve(rootDir, 'src/content'),
     "$lib": path.resolve(rootDir, 'src/lib'),
     "$entities": path.resolve(rootDir, 'src/lib/extension/entities'),
     "$styles": path.resolve(rootDir, 'src/styles'),