docs: Move to issue forms

[Joffcom]

This PR moves us to GitHub issue forms
Removes the template check workflow as the fields are required in the form

Can be seen in action here: https://github.com/Joffcom/n8n/issues/new/choose

[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (05e6f2a) 33.61% compared to head (8640856) 33.60%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7510      +/-   ##
==========================================
- Coverage   33.61%   33.60%   -0.01%     
==========================================
  Files        3399     3399              
  Lines      207468   207472       +4     
  Branches    22419    22414       -5     
==========================================
- Hits        69737    69730       -7     
- Misses     136598   136609      +11     
  Partials     1133     1133              

Files	Coverage Δ
...src/databases/repositories/execution.repository.ts	42.70% <21.42%> (-0.38%)	⬇️

... and 4 files with indirect coverage changes

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[Joffcom]

Closing in favour of #8585