Fix About HTML path

app/gabsocial/actions/about.js

@@ -6,7 +6,7 @@ export const FETCH_ABOUT_PAGE_FAIL    = 'FETCH_ABOUT_PAGE_FAIL';
 export function fetchAboutPage(slug = 'index') {
   return (dispatch, getState) => {
     dispatch({ type: FETCH_ABOUT_PAGE_REQUEST, slug });
-    return api(getState).get(`/soapbox/about/${slug}.html`).catch(error => {
+    return api(getState).get(`/instance/about/${slug}.html`).catch(error => {
       dispatch({ type: FETCH_ABOUT_PAGE_FAIL, slug });
     });
   };