Convert links to obsidian-compatible labels

[dmarx]

1. [ ] update scripts that ignore specific commits to ignore front matter
   • non-trivial af. the current approach only works because labels are on a given line
   • here's something that could work, but would be a whole thing to implement
     1. get list of files modified
     2. identify line at which front matter ends
     3. only respect diffs below that line
2. [ ] copy labels into front matter
3. [ ] modify scripts that utilize/manipulate labels to parse front matter