Simplify Badges-Offerings rule

What does this MR do?

While discussing some Vale quirks in slack, we made some realizations:

• We often use \n or \n\n to look for the start of a line instead of ^, but learned from https://github.com/errata-ai/vale/issues/646#issuecomment-1596302642 that this is due to not understanding the different between raw and tokens for the regex. Changing to tokens lets us find the start of the line with ^, which significantly improves the output in editors. In those rules, the editor now underlines the actual issue, rather than the line above. For example, for incorrect note blocks:

  Before	After

• We also used some regex that was quite inefficient. With more experience, I was able to clean up rules for faster execution. For example

  • Before (4233 steps):
    After (1592 steps):
  • Before (3158 steps):
    After (669 steps):
  • Before (789 steps):
    After (20 steps):

• Some rules were unnecessarily complex, and we could just simplify to make them easier to read.

Related issues

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