Add "find friends", "invite people", and more to getting started footer (#7803)

- Find friends from Twitter (bridge)
- Invite people (when invites enabled)
- Security (change e-mail/password)
- Developers (create OAuth apps/tokens)

app/javascript/mastodon/features/getting_started/index.js

@@ -7,7 +7,7 @@ import { connect } from 'react-redux';
 import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import ImmutablePureComponent from 'react-immutable-pure-component';
-import { me } from '../../initial_state';
+import { me, invitesEnabled } from '../../initial_state';
 import { fetchFollowRequests } from '../../actions/accounts';
 import { List as ImmutableList } from 'immutable';
 import { Link } from 'react-router-dom';
@@ -135,9 +135,13 @@ export default class GettingStarted extends ImmutablePureComponent {
 
         <div className='getting-started getting-started__footer'>
           <ul>
+            <li><a href='https://bridge.joinmastodon.org/' target='_blank'><FormattedMessage id='getting_started.find_friends' defaultMessage='Find friends from Twitter' /></a> · </li>
+            {invitesEnabled && <li><a href='/invites' target='_blank'><FormattedMessage id='getting_started.invite' defaultMessage='Invite people' /></a> · </li>}
             {multiColumn && <li><Link to='/keyboard-shortcuts'><FormattedMessage id='navigation_bar.keyboard_shortcuts' defaultMessage='Hotkeys' /></Link> · </li>}
+            <li><a href='/auth/edit'><FormattedMessage id='getting_started.security' defaultMessage='Security' /></a> · </li>
             <li><a href='/about/more' target='_blank'><FormattedMessage id='navigation_bar.info' defaultMessage='About this instance' /></a> · </li>
             <li><a href='/terms' target='_blank'><FormattedMessage id='getting_started.terms' defaultMessage='Terms of service' /></a> · </li>
+            <li><a href='/settings/applications' target='_blank'><FormattedMessage id='getting_started.developers' defaultMessage='Developers' /></a> · </li>
             <li><a href='https://github.com/tootsuite/documentation#documentation' target='_blank'><FormattedMessage id='getting_started.documentation' defaultMessage='Documentation' /></a> · </li>
             <li><a href='/auth/sign_out' data-method='delete'><FormattedMessage id='navigation_bar.logout' defaultMessage='Logout' /></a></li>
           </ul>

app/javascript/mastodon/initial_state.js

@@ -11,5 +11,6 @@ export const boostModal = getMeta('boost_modal');
 export const deleteModal = getMeta('delete_modal');
 export const me = getMeta('me');
 export const searchEnabled = getMeta('search_enabled');
+export const invitesEnabled = getMeta('invites_enabled');
 
 export default initialState;

app/serializers/initial_state_serializer.rb

@@ -14,6 +14,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       domain: Rails.configuration.x.local_domain,
       admin: object.admin&.id&.to_s,
       search_enabled: Chewy.enabled?,
+      invites_enabled: Setting.min_invite_role == 'user',
     }
 
     if object.current_account