feat: Make markdownlint ignore generated contributors table

[JReinhold]

What:
Make markdownlint ignore generated table of contributors.

Why:
Currently, when generating a table of contributors, markdownlint will fail, because the line-length is more that the default, and markdownlint defaults to not allow inline html.
We can disable markdownlint for the generated table, to make all-contributors-cli work out of the box with markdownlint, just like it currently does with prettier.

How:
Just like the generator inserts a prettier-ignore tag, it now also inserts a markdownlint-disable tag.
Additionally, I've scoped the prettier-ignore and markdownlint tags to only have an effect on the generated table, by changing them to prettier-ignore-start/end and markdownlint-disable/enable respectively. This might be an unnecessary addition to prettier, as the table is just one node, and this a single prettier-ignore tag works. But I wanted it to be consistent with the disabling of markdownlint, and this ensures that prettier continues to work in the future, should we add more nodes to the table. If you disagree, I'll happily remove it again.

The changes have been tested by generating a new table in this repo, using the changed CLI (npm run start).

Checklist:

• Documentation N/A
• Tests
• Ready to be merged
• Added myself to contributors table

Workaround:

Currently this can be achieved manually by anyone, by pre- and post-fixing the ALL-CONTRIBUTORS-LIST tags with the markdownlint tags:

<!-- markdownlint-disable -->
<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
<!-- prettier-ignore -->
... table
<!-- ALL-CONTRIBUTORS-LIST:END -->
<!-- markdownlint-enable -->

[Berkmann18]

Thank you :).

[all-contributors-release-bot]

🎉 This PR is included in version 6.8.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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