Chore: Remove generated PUML image and exclude it from .gitignore

[kaixin-hc]

What is the purpose of this pull request?

• Documentation update
• Bug fix
• Feature addition or enhancement
• Code maintenance
• DevOps
• Improve developer experience
• Others, please explain:

Overview of changes:
Add the generated PNG to the gitignore as described in this part of the dev guide as it was erroneously committed.

Anything you'd like to highlight/discuss:

Testing instructions:

Proposed commit message: (wrap lines at 72 characters)

Chore: Remove generated PUML image and exclude it from .gitignore

Checklist: ☑️

• Updated the documentation for feature additions and enhancements
• Added tests for bug fixes or features
• Linked all related issues
• No unrelated changes

---

Reviewer checklist:

Indicate the SEMVER impact of the PR:

• Major (when you make incompatible API changes)
• Minor (when you add functionality in a backward compatible manner)
• Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking
  NIL

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[yucheng11122017]

LGTM! Thanks for the work

[kaixin-hc]

Thanks for your review!

After investigation, tests are failing due to a mismatch between expected files and generated files. We can refer to this PR. This is because in packages/cli/test/functional/testSites.js, a list of plantuml files that are expected in test-site are saved, and in the compare function the existence of these ignored files is checked for before all ignored files are filtered out and compared.

However, in this line compare(siteName, 'expected', '_site', siteName === 'test_site' ? plantumlGeneratedFiles : []); essentially plantuml files are only checked for in test_site.

I'll make a separate issue about fixing this, and we can merge this chore once this section has been improved.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.14%. Comparing base (003822f) to head (54c8824).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2497   +/-   ##
=======================================
  Coverage   51.14%   51.14%           
=======================================
  Files         124      124           
  Lines        5359     5359           
  Branches     1152     1152           
=======================================
  Hits         2741     2741           
  Misses       2328     2328           
  Partials      290      290           

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