How I made this site
I made this site linuxintro.org together with http://www.staerk.de/thorsten. See http://www.staerk.de/thorsten/How_I_made_this_site.
2019-12-19: I need to embed youtube videos. For this, there is an extension that I do not get to work: https://www.mediawiki.org/wiki/Extension:YouTube
2020-03-29: I found in google's webmaster console that a viewport was missing. Adding it will help with the readability on mobile devices. I put the viewport directly into OutPutPage.php next to the google analytics code. Then I changed the default skin to chick and everyhing was well with the exception of the pre and code blocks. The pre and code blocks also destroy my adaptivethumb plugin's usage.
2020-03-30: I installed https://www.mediawiki.org/wiki/Extension:SyntaxHighlighter in order to have a well-behaving alternative to pre and code blocks.
2022-07-22: I got https://www.mediawiki.org/wiki/Extension:YouTube installed, no idea where there can be issues, just followed the instructions.