Split Configure API into Content, Model API paths (#857)

## Major: Breaking Changes
- Move API endpoints under /configure/<type>/model to /api/model/<type>
- Move API endpoints under /api/configure/content/ to /api/content/
- Accept file deletion requests by clients during sync
- Split /api/v1/index/update into /api/content PUT, PATCH API endpoints

## Minor: Create New API Endpoint
- Create API endpoints to get user content configurations

Related: #852

src/interface/web/app/common/chatFunctions.ts

@@ -277,8 +277,8 @@ export function uploadDataForIndexing(
     // Wait for all files to be read before making the fetch request
     Promise.all(fileReadPromises)
         .then(() => {
-            return fetch("/api/v1/index/update?force=false&client=web", {
-                method: "POST",
+            return fetch("/api/content?client=web", {
+                method: "PATCH",
                 body: formData,
             });
         })