Remove IkiWiki's CGI entrypoint
The last IkiWiki CGI feature we used was the website build and .po files update via the pingee plugin, but now the website is built via GitLab CI and we have no need for the dynamic CGI entrypoint anymore.
The last IkiWiki CGI feature we used was the website build and .po files update via the pingee plugin, but now the website is built via GitLab CI and we have no need for the dynamic CGI entrypoint anymore.