Create basic swMATH frontend

[physikerwelt]

Describe the issue

• [ ] Import static pages
• [ ] Import logos
• [x] Change Add LocalSettings override
• [x] #292
• [x] Setup admin account

[physikerwelt]

I created

mardi-test-user@mardi01:~/portal-compose/mediawiki/LocalSettings.d$ ls -lah zz*
-rw-r--r-- 1 mardi-test-user mardi-test-user 164 20. Aug 17:32 zz_swMATH_credentials.php
mardi-test-user@mardi01:~/portal-compose/mediawiki/LocalSettings.d$ md5sum zz*
5f37383d9bf71d76ff0bf6e8e3d233fe  zz_swMATH_credentials.php
mardi-test-user@mardi01:~/portal-compose/mediawiki/LocalSettings.d$ cat zz_swMATH_credentials.php 
<?php
if ( str_contains($_SERVER['SERVER_NAME'],'swmath') ){
  $wgDBuser = '***';
  $wgDBpassword = '***';
  $wgDBname = '***';
}

[physikerwelt]

created a user and send the credentials to @Mazztok45