Enable syntax highlight

[HonkingGoose]

What would you like to be able to do?

I want to use syntax highlighting, so that the code examples use colors for the code/keywords.

Did you already have any implementation ideas?

I already tried the syntax highlighting, but it breaks our presets-config page, due to some bad input.
Once the bad input is fixed we can enable highlighting again.

• renovatebot/renovate#13348 <--- This issue needs to be fixed first
• Wait until Renovate bot updates us to the submodule of renovatebot/renovate that includes the fix
• Enable syntax highlighting by putting - pymdownx.highlight and - pymdownx.superfences in the markdown_extensions: array of the mkdocs.yml config file, see: #126