Add nf-core template version badges to README

[jfy133]

Should add automation to bump the template version on sync, but that's for cleverer people than myself.

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

[mirpedrol]

The badge version will update when updating the template now. I have also fixed the bump-version command and lining.
I will let @mashehu or someone else review my code since I added quite a bit 😄

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.49%. Comparing base (38813b0) to head (08e0d7e).
Report is 43 commits behind head on dev.

Files with missing lines	Patch %	Lines
nf_core/pipelines/lint/readme.py	85.71%	1 Missing ⚠️

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[mashehu]

one small thing about what to link, rest looks good