Static antenna position plot on Session Detail

[tchamberlin]

Blocked by Alda sandbox setup

Similar to #5, but instead of showing all antenna data, we just want the data for a given Session. For example, https://gbtarchive-beta.gb.nrao.edu/disk/sessions/AGBT17A_304_03/ should display only the antenna positions recorded during all scans from AGBT17A_304_03

This will require a "database" of per-session antenna position plots -- I will provide this. Your code can expect to find a given Session's antenna plot at static URL 'images/antenna_positions/session/{{session_name}}.jpg'. So, in the above example, it would load STATIC_ROOT + '/images/antenna_positions/session/AGBT17A_304_03.jpg'

[KaseyW31]

• Wrote a script to loop through my original script (that generates a map image for a single parquet file) for a list of paths. In hindsight, I would just modify my original script to speed things to avoid importing packages at every iteration
• Had to look up static tags in Django and how to use them with variables

[tchamberlin]

TODO: Remove images from git, squash/merge, done

[KaseyW31]

I think I removed all the images, is it ok to squash/merge?