Add remark configuration

[Potherca]

Proposed Changes

This MR adds a configuration file for Remark, so there is now one consistent way Markdown should be written in this repo.
The configuration uses the lint-recommended preset, with as only exception that the list-item-indent has been set to only require a single space after a list character (as opposed to the multi-space default).

Other than a few links in the README, all markdown files in the repo already adhere to this standard.

As there is already a GitHub action that runs Remark, no other changes are needed.

Related Issues

This MR is inspired by the comment from @jrfnl in #118 regarding inconsistencies in my Markdown.
I suggested adding a Remark config, so here it is! 😁

[jrfnl]

Good addition.

• Should some information be added to the CONTRIBUTING file to document that markdown is expected to conform to the Remark rules ?
• Should some information be added to the CONTRIBUTING file on how to locally install and run this check ?
• If the above would suggest installation in a project local manner - are there files which should be added to the .gitignore file ?

A quick search yielded me these as relevant links:

• https://github.com/remarkjs/remark-lint
• https://github.com/remarkjs/remark-lint/blob/main/doc/rules.md

[Potherca]

Good points.

I've been thinking about that as well. Not just for Remark, but regarding the other GitHub actions we run... There seems to be a lot of implicit knowledge assumed, which is a bad sign.

I've created a separate issue for documenting how to run all of the QA tools in our current pipeline and continue this conversation there: #123

[jrfnl]

Approving under the understanding that "how to run the tooling" will be documented in a separate PR.

[Potherca]

Merging without re-review as there are no new changes, just a rebase of already reviewed changes.