Links between this official documentation and the community platform

[marc-farre]

I suggest to add links between this official documentation and the community platform.

E.g. for cron jobs:

• On https://docs.humhub.org/docs/admin/cron-jobs/#cronjob-configuration add a link to https://community.humhub.com/s/installation-and-setup/wiki/Cron+Job+Setup (e.g. at the bottom of the page: "More examples on the community platform").
• On https://community.humhub.com/s/installation-and-setup/wiki/Cron+Job+Setup add a link to https://docs.humhub.org/docs/admin/cron-jobs/#cronjob-configuration (e.g. at the beginning of the page: "Official documentation").

I think this might help new admins who may not always be aware of all these pages.

[luke-]

@funkycram Very good point.

I would like to add a (hint, warning, info) banner at the top of all relevant documentation pages with a link to the related community wiki page for examples.

Also, we should remove all non-standard examples (e.g. Plesk) from the official documentation and maintain them only in the community wiki.