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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

❗ 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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