fix: add cz-conventional-gitmoji to the third party docs

[ljnsn]

Description

Adding my plugin cz-conventional-gitmoji to the third party tools section in the docs.

Checklist

- [ ] Add test cases to all the changes you introduce
- [ ] Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
- [ ] Test the changes on the local machine manually

• Update the documentation for the changes

[Lee-W]

Thanks for adding this plugin! Could you please reword the commit as doc: add cz-conventional-gitmoji to the third party docs?

[ljnsn]

Yep, done :)

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (120d514) 97.33% compared to head (c758b25) 97.39%.
Report is 157 commits behind head on master.

Files	Patch %	Lines
commitizen/cli.py	82.14%	5 Missing ⚠️
commitizen/providers/scm_provider.py	91.17%	3 Missing ⚠️
commitizen/git.py	80.00%	2 Missing ⚠️
commitizen/changelog_formats/__init__.py	97.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #969      +/-   ##
==========================================
+ Coverage   97.33%   97.39%   +0.05%     
==========================================
  Files          42       55      +13     
  Lines        2104     2341     +237     
==========================================
+ Hits         2048     2280     +232     
- Misses         56       61       +5     

Flag	Coverage Δ
unittests	97.39% <97.93%> (+0.05%)	⬆️

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