Split /api/v1/index/update into /api/content PUT, PATCH API endpoints

- This utilizes PUT, PATCH HTTP method semantics to remove need for
  the "regenerate" query param and "/update" url suffix
- This should make the url more succinct and API request intent more
  understandable by using existing HTTP method semantics

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

@@ -275,8 +275,8 @@ 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,
             });
         })