Readme Overhaul

[paulbrodersen]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

The current README is outdated and very terse.

What does this PR do?

I have made the following changes:

• Removed the old images as they had a very low ink-to-information ratio; added an image from the paper with a high ink-to-information ratio as a placeholder. I don't think this particular image should be used long-term but it is better than the previous ones and can serve as a template for a new and improved gallery image. However, I lack both time and the data to make one, so someone else would have to step in.
• Removed outdated badges (GPLv3; Black); added a new "Downloads" badge as "social proof" (corny, but so are all badges and it helps).
• Added a "Quickstart" section demonstrating the basic workflow.
• Added a BibTeX entry to the "Citing BrainRender" section.
• Added additional context to the "Documentation" section (who or what is BrainGlobe and why does it host the BrainRender documentation?).
• Shortened the tag line, so it's a tag line and not an essay.

The result can be inspected here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.47%. Comparing base (1ff1a5e) to head (fc2c71e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #337   +/-   ##
=======================================
  Coverage   86.47%   86.47%           
=======================================
  Files          27       27           
  Lines        1220     1220           
=======================================
  Hits         1055     1055           
  Misses        165      165           

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[adamltyson]

Thanks @paulbrodersen. I left a few small comments.