template: update comments in .editorconfig file

[maxulysse]

I don't think we need to ignore README as we ignore python and markdown just after.

• Adding comments about ignoring markdown

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.40%. Comparing base (0ae1dec) to head (68c0a94).

:exclamation: Current head 68c0a94 differs from pull request most recent head 195452d. Consider uploading reports for the commit 195452d to get more accurate results

Additional details and impacted files

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[maxulysse]

Done in https://github.com/nf-core/tools/pull/2953