[docs] Add AppArmor profile for Debian and Ubuntu installations (#1183)

* Enable the 'admonitions' Markdown extension for Mkdocs.

The admonitions extension to Python-Markdown allows you to include
rST-style "admonitions" to Markdown documents, for instance,

    !!! note
        Here's an important note to keep in mind!

In general, the current documentation uses bold text to try to achieve
the same effect, which is a bit harder to notice and makes it difficult
to differentiate between "here's something useful to know" versus "here
there be dragons".

* Add AppArmor profile and documentation for LSM-related sandboxing

This commit adds an AppArmor profile for gotosocial in
examples/apparmor/gotosocial. This will (hopefully) serve as a helpful
security mitigation for people are planning on deploying GTS on a
Debian-family Linux distribution.

I've also updates the documentation to include some information about
deploying GTS with either AppArmor or SELinux (moving the documentation
for the former out of the "binary installation guide" docs).

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