docs: typedoc improvements

[erickzhao]

Cleanup PR based on learnings from the TypeDoc PRs.

• Direct use of npx typedoc rather than JavaScript API removes legacy build_docs.js from code. Their JavaScript API has minimal documentation, and most options are available via typedoc.json configuration anyways.
• Use of externalSymbolLinkMappings to show links to types available via external Electron packages (e.g. get and notarize).

Tag changes:

• Changed plaintext examples to use the @example tag.
• Fixed outstanding cases of legacy [[link tag syntax]] to use {@link tag syntax}.
• Used @interface to expand utility types whenever possible (e.g. instead of Omit<TypeA, 'KeyB' | 'KeyC'>, adding the @interface tag makes it so that all of TypeA's properties are displayed in the API documentation excluding KeyB and KeyC.
• Used @internal and excludeInternals to hide types that should not be used by end users of Electron Packager.

[malept]

Do we also need to add explicit external link config for osx-sign and windows-sign? Plus any other dependency where we proxy the options that I'm forgetting.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.06%. Comparing base (e94088d) to head (f24e1e6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1734      +/-   ##
==========================================
- Coverage   89.28%   89.06%   -0.23%     
==========================================
  Files          17       17              
  Lines         905      905              
  Branches      187      187              
==========================================
- Hits          808      806       -2     
- Misses         61       62       +1     
- Partials       36       37       +1     

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[continuous-auth[bot]]

:tada: This PR is included in version 18.4.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: