✨ Adding new heading configuration

[vikripermana21]

Hi Kolkov!, i wanted to request a PR, this PR provide a feature that now headings can be customized. I hope u accept this PR. Thanks

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 20.79%. Comparing base (40431f4) to head (4179eef).

Files with missing lines	Patch %	Lines
...angular-editor/src/lib/angular-editor.component.ts	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
+ Coverage   20.66%   20.79%   +0.12%     
==========================================
  Files           8        8              
  Lines         479      481       +2     
  Branches      103      104       +1     
==========================================
+ Hits           99      100       +1     
  Misses        377      377              
- Partials        3        4       +1     

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