fix: do not build docs for external projects

[FrogTheFrog]

Description

Do not build docs for external projects. Sunshine and libdd are fighting over target names otherwise.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[ReenigneArcher]

Could you make this change to https://github.com/LizardByte/tray as well?

Otherwise, I need to wait to merge this until I can get to that.

[ReenigneArcher]

This might be a hint to the issues with coverage in the this repo.

[FrogTheFrog]

This might be a hint to the issues with coverage in the this repo.

On MacOS it simply failed to upload... Unless you're talking about something else

[ReenigneArcher]

That was Linux:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.84%. Comparing base (b30c2e1) to head (2b6adf2).
Report is 17 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #94   +/-   ##
=======================================
  Coverage   93.84%   93.84%           
=======================================
  Files          32       32           
  Lines        1820     1820           
  Branches     1014     1014           
=======================================
  Hits         1708     1708           
- Misses         49       58    +9     
+ Partials       63       54    -9     

Flag	Coverage Δ
Linux	89.56% <ø> (ø)
Windows	93.84% <ø> (ø)

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see 1 file with indirect coverage changes