Member docs: Update dogs on tags and mentions.

Rewrote it and corrected some outdated information about how to tag
forums etc. Also cleaned up the markup a bit.

Added information and links about which apps and admin addons are
required for given functionality.

Also added some images to help illustrate some subjects.

Uncertain about whether the information on how the autocomplete popup is
populated is correct anymore. Underlined it and added a question mark to
make sure it annoys someone (possibly me) to figure it out.

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