Fetch list of tabs and use it to render menu in the Settings section

This MR complements !195 (merged) and should be merged after pleroma!3348 (closed) is merged

Blocked by pleroma!3348 (closed)

src/api/settings.js

@@ -12,15 +12,6 @@ export async function deleteInstanceDocument(name, authHost, token) {
 }
 
 export async function fetchDescription(authHost, token) {
-  return await request({
-    baseURL: baseName(authHost),
-    url: `/api/v1/pleroma/admin/config/descriptions`,
-    method: 'get',
-    headers: authHeaders(token)
-  })
-}
-
-export async function fetchDescription2(authHost, token) {
   return await request({
     baseURL: baseName(authHost),
     url: `/api/v2/pleroma/admin/config/descriptions`,