Deprecate broken plugins, move others to sugarcube-contrib.

[critocrito]

There are a whole bunch of plugins that are either broken (e.g. instagram) or it is unclear if they are still working.

Plugins that are known to be broken:

• instagram_feed
• facebook_api_user
• facebook_api_page
• facebook_api_feed

Plugins that haven't been tested in a long time:

• aqicn_station
• google_reverse_images_files
• google_images
• google_search
• guardian_search
• http_wget
• regex_match
• sec_search