Add customisation option to remove all GitHub support with nf-core create

[mirpedrol]

Close #1677

Add an option to remove all GitHub hosting content from a pipeline template built with nf-core create

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #1766 (e64d248) into dev (d404374) will increase coverage by 0.02%.
The diff coverage is 75.00%.

❗ Current head e64d248 differs from pull request most recent head 4ce9a75. Consider uploading reports for the commit 4ce9a75 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1766      +/-   ##
==========================================
+ Coverage   69.22%   69.24%   +0.02%     
==========================================
  Files          59       59              
  Lines        7142     7151       +9     
==========================================
+ Hits         4944     4952       +8     
- Misses       2198     2199       +1     

Impacted Files	Coverage Δ
nf_core/modules/modules_json.py	74.65% <ø> (ø)
nf_core/create.py	62.45% <16.66%> (-0.98%)	⬇️
nf_core/modules/modules_repo.py	84.21% <66.66%> (+1.35%)	⬆️
nf_core/__main__.py	53.50% <100.00%> (+0.72%)	⬆️
nf_core/lint/__init__.py	74.18% <100.00%> (+0.10%)	⬆️
nf_core/modules/lint/__init__.py	82.56% <100.00%> (+0.08%)	⬆️

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