Lint markdown files: Add check for capitalized headings
I often see MRs which do not respect the rule
Capitalize headings, e.g. Exclusive Reservation of Hardware
Thus, we should write a test and add this test to the CI pipeline.
Starting points:
- Since we enforce some rules on headings already, it should be strait forward to parse the changed markdown files for one or multiple
#
characters. - A whitelist with not-to-capitalize characters should be implemented.