docs(color): parse more color formats and add docs

[joshka]

Fixes #305

[joshka]

Doc Preview:

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[orhun]

Have you considered adding test cases for the invalid color formats as well?

[joshka]

@orhun there are existing tests for the invalid formats - am I misunderstanding what you're asking for here?

https://github.com/joshka/ratatui/blob/f100d222c962de59c23ee964be4cfe78c601d2d3/src/style.rs#L578-L593

[orhun]

Everything is okay as far as we cover these changes I think:

https://github.com/joshka/ratatui/blob/f100d222c962de59c23ee964be4cfe78c601d2d3/src/style.rs#L421-L430

[codecov]

Codecov Report

Merging #306 (916744e) into main (804115a) will increase coverage by 0.10%.
The diff coverage is 98.85%.

@@            Coverage Diff             @@
##             main     #306      +/-   ##
==========================================
+ Coverage   83.11%   83.21%   +0.10%     
==========================================
  Files          37       37              
  Lines        7717     7764      +47     
==========================================
+ Hits         6414     6461      +47     
  Misses       1303     1303              

Impacted Files	Coverage Δ
src/style.rs	88.92% <98.85%> (+2.07%)	⬆️

[joshka]

Force push updates the tests to cover more happy paths and a few useful error paths, and moves the aliases out of the match into the replacements only.