all: conform with Lighthouse recommendations

The foreground color changes to conform with color-contrast
ratio threshold, with score AAA. [1]

Add ARIA role to each section of pages: banner for topbar,
main for page, and contentinfo for footer.
This is to make the webpage more robust and functional no matter
what screen reader technology is used. [2]

For touch devices, increase the line height on Table of Contents.
This is to help users who may have difficulty in confidently targeting or
operating small controls. [3]

[1]: https://dequeuniversity.com/rules/axe/4.11/color-contrast
[2]: https://dequeuniversity.com/rules/axe/4.11/landmark-one-main
[3]: https://dequeuniversity.com/rules/axe/4.11/target-size

0 files changed, 0 insertions, 0 deletions