Relevant template

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Problem description (optional)

We can even more improve the linting for documentation by adding a spell checking mechanism to the contents of our markdown files.

Desired solution

I researched some possible tools (which support markdown files and are all available via node packages) and found

• https://github.com/textlint/textlint (npm dependency, actively maintained, rules need to be installed separately)
• https://github.com/streetsidesoftware/cspell
• https://github.com/lukeapage/node-markdown-spellcheck

We need to check which rules are useful (if any).

Considered alternatives (optional)

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Additional context (optional)

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