Headings should use title case

[jacobhq]

All headings (or at least all page names) should use title case. Example:

- Link and navigation
+ Link and Navigation

Some reading:

• https://apastyle.apa.org/style-grammar-guidelines/capitalization/title-case
• https://titlecaseconverter.com/blog/cmos-18-changes/

This would be something I would work on at the end of our two week focus, as it is quite quick, but also pretty important IMHO.

Please let me know what you think :)