Support Bootstrap icons

[yiwen101]

What is the purpose of this pull request?

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

Overview of changes: Support bootstrap icons #1977

Anything you'd like to highlight/discuss: I need to upload the copy of bootstrap-icons to the expected folder to pass test (and in current code, the expected folder also contains the source code of all other icons supported) That is where the +50 000 comes from.

Testing instructions:

Proposed commit message: (wrap lines at 72 characters) Support Bootstrap icons

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Checklist: :ballot_box_with_check:

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

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Reviewer checklist:

Indicate the SEMVER impact of the PR:

• [ ] Major (when you make incompatible API changes)
• [x] 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

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).

[codecov[bot]]

Codecov Report

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

Project coverage is 51.08%. Comparing base (147899a) to head (7c635bd).

:exclamation: Current head 7c635bd differs from pull request most recent head 1e473bd. Consider uploading reports for the commit 1e473bd to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2494 +/- ## ========================================== + Coverage 51.02% 51.08% +0.06% ========================================== Files 124 124 Lines 5372 5367 -5 Branches 1159 1155 -4 ========================================== + Hits 2741 2742 +1 + Misses 2341 2335 -6 Partials 290 290 ```

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[damithc]

Thanks for attempting this @yiwen101 This will be a good addition to the different icon sets we support.

[github-actions[bot]]

@yucheng11122017 Each PR must have a SEMVER impact label, please remember to label the PR properly.

[damithc]

Feature in action https://nus-cs2103-ay2324s2.github.io/website/admin/tp-w9.html