Astro mode syntax highlighting

[legendSabbir]

Description of changes:

Syntax highlighting for Astro mode

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[akoreman]

Thanks for your contribution, could you also add an example doc for the mode to the demo/kitchen-sink/docs folder and add it to the modelist in src/ext/modelist.js. For reference on what to add where, see PR #5169.

[legendSabbir]

@akoreman hey i've added a file to kitchen sink and also added in modelist . also made little change on the mode file

[akoreman]

Could you:

• fix the issues thrown by the linter in the built.
• remove the mode and highlight rules files from the src folder (they should only be in the src/mode folder).

[legendSabbir]

@akoreman try now

[codecov]

Codecov Report

Patch coverage: 60.31% and project coverage change: -0.04% ⚠️

Comparison is base (bccff5a) 87.23% compared to head (430603c) 87.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5269      +/-   ##
==========================================
- Coverage   87.23%   87.19%   -0.04%     
==========================================
  Files         565      567       +2     
  Lines       45288    45351      +63     
  Branches     6929     6941      +12     
==========================================
+ Hits        39508    39546      +38     
- Misses       5780     5805      +25     

Flag	Coverage Δ
unittests	87.19% <60.31%> (-0.04%)	⬇️

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Files Changed	Coverage Δ
src/mode/astro_highlight_rules.js	50.98% <50.98%> (ø)
src/mode/astro.js	100.00% <100.00%> (ø)

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[akoreman]

thanks for fixing the build errors, mode looks good to me. Could you add some tests covering the mode (see for example here for an example of tests for a mode)

[legendSabbir]

I don't think i can do this . Isn't it optional 😕 ? if it's needed then Can you do it 😅

[InspiredGuy]

The new Astro mode just inherits HTMLMode, so the tests for the mode itself are not really necessary. I'm merging this PR assuming one of the next mode-related PRs will regenerate tokens for highlight rule tests which will include Astro mode as well.