Add an eta-v analysis page for the source query

[ajstewart]

@marxide I wanted to practise some python and Django stuff so I thought I'd have a go at making something for #410.

I've somewhat cobbled together some sort of solution that seems to work. How good it is I'm not sure. While it's snappy locally I'm concerned at how it would run on a full run on Nimbus though it should still be fast. I've also added png previews of measurements on the light curve hovertool - I wonder if that is faster to gather than the fits...

This is not complete but I wondered what you thought. There are a few warnings in the console but I cannot figure them out, my front-end skills weren't quite there!

Easier to show in a video, though I couldn't find a way to quickly save it at double speed to I suggest scrubbing 😅

https://user-images.githubusercontent.com/3306161/143328350-039658ec-c7c4-491f-a0ab-2600d41d20b2.mov

To do:

• [x] Fix log zooming.
• [x] Test on large run.
• [x] Documentation.
• [x] Add data shader image for large run to docs.

Fixes #410.

[ajstewart]

I've noticed the zooming on the bokeh plot doesn't work in the low value regions. Not sure why as of yet.

Edit: Fixed in https://github.com/askap-vast/vast-pipeline/pull/586/commits/353903e112943635ba99c91b513c1f7866c5f67b.

[ajstewart]

@marxide I think this is now ready. This turned into the plot and fixing the current test issues with 3.8 and 3.9 as I merged it...

To summarise, main new features and fixes are:

• The whole eta-v plot interface + doc pages.
  • Now with added Datashader for high source counts.
• Cutouts on the light curve hovertools.
• Bumped minimum Django and Dask, bumped and fixed bokeh version.
• Full new poetry.lock generated on 3.8.12.
• Test python versions updated.
• Two fixes for regressions with updating the dependencies (I suspect pandas to be the main culprit).
• Added missing docs from last PR that I noticed (about Q_CLUSTER_MAX_ATTEMPTS).
• Added doc badge to README.md.

Final edits I'll get around to doing in another PR:

• Fix the page refresh on the adding to favourites.
• Add comments and tag box to analysis page (with again avoiding the refresh hopefully).