Fixes rendering for checkboxes

[Eclipse-Dominator]

Summary:

Fixes #1152

Changes Made:

• uses emoji to render checkboxes instead of using tag to bypass the html sanitizer.

Proposed Commit Message:

Checkboxes are not longer being rendered due to the sanitizer sanitizing html input tags

However, removing the sanitizer could be unsafe

Let's
* Fixes checkboxes being sanitized when rendered in markdown
* Replace checkbox rendering via the use of emojis 
* Addition of fontawesome icon library to standardize emoji font face

[cheehongw]

☑️ LGTM ☑️

Would be good to see how the emoji looks like on different OSes

[Eclipse-Dominator]

As this is a replacement workaround, I do think it is a good idea to test if the emoji display functions normally on other systems and browsers.

Below is how it looked like on windows 11 edge and chrome browser

I'm not sure if this looks acceptable when displayed on other system if someone is free do try to test it out by pasting
◻️test1
☑️test2
in the markdown editor

[damithc]

Are we using an icon font such as fontawesome? In that case we can try using matching icons provided by the font, as they will look the same in all browsers.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (d6eb065) 53.82% compared to head (e44e7c1) 53.81%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1155      +/-   ##
==========================================
- Coverage   53.82%   53.81%   -0.01%     
==========================================
  Files          99       99              
  Lines        2696     2698       +2     
  Branches      497      498       +1     
==========================================
+ Hits         1451     1452       +1     
- Misses        915      916       +1     
  Partials      330      330              

Impacted Files	Coverage Δ
src/app/shared/lib/marked.ts	87.50% <100.00%> (-12.50%)	⬇️

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[chunweii]

LGTM!

[kkangs0226]

Checked that the issue has been fixed, LGTM.
Let's include the addition of font-awesome icons in the commit message as well.
Also, please follow this guide for crafting your commit messages. https://se-education.org/guides/conventions/git.html

[kkangs0226]

LGTM