Refactor frontmatter location parsing to util function

[charles-toller]

Pull Request Description

Fixes issues with frontmatter location parsing, and refactors it to a central function.

Changes Proposed

Refactors the frontmatter location parsing to a util function, and enables the usage of strings in that field, e.x.:

• other text [<lat>,<long>]
• <lat>,<long>
• <percent>%,<percent>%

Related Issues

Fixes #431

Checklist

• [x] I have read the contribution guidelines and code of conduct.
• [x] I have tested the changes locally and they are working as expected.
• [x] I have added appropriate comments and documentation for the code changes.
• [x] My code follows the coding style and standards of this project.
• [x] I have rebased my branch on the latest main (or master) branch.
• [x] All tests (if applicable) have passed successfully.
• [x] I have run linters and fixed any issues.
  • This project doesn't seem to have a linter of choice
• [x] I have checked for any potential security issues or vulnerabilities.

Screenshots (if applicable)

Additional Notes