Link to docs when a non-admin user tries to log in

src/permission.js

@@ -34,6 +34,7 @@ export const beforeEachRoute = (to, from, next) => {
         }).catch((err) => {
           store.dispatch('FedLogOut').then(() => {
             Message({
+              dangerouslyUseHTMLString: true,
               message: err,
               type: 'error',
               duration: 7 * 1000

src/store/modules/user.js

@@ -89,7 +89,9 @@ const user = {
           if (data.pleroma && data.pleroma.is_admin) {
             commit('SET_ROLES', ['admin'])
           } else {
-            reject('This user doesn\`t have admin rights. Try another credentials or run `MIX_ENV=prod mix pleroma.user set NICKNAME --admin`')
+            reject('<span>This user doesn\`t have admin rights. Try another credentials or see </span>' +
+            '<u><a target="_blank" href="https://docs.pleroma.social/backend/administration/CLI_tasks/user/#set-the-value-of-the-given-users-settings">docs</a></u>' +
+            '<span> to find out how to make this user an admin</span>')
           }
 
           commit('SET_NAME', data.username)