Improve accessibility

[captn3m0]

Is your feature request related to a problem? Please describe.
Product pages can be made more accessible.

Describe the solution you'd like
A clear review of accessibility issues, and fixes for the same. Most of this comes from the information we stuff in the table, but might apply elsewhere. This includes:

1. Colors used in the table (See Accessibility Issues #1618, Improve contrast to meet WCAG #1620)
2. Meaning of the colors
3. Meaning of the strikethrough
4. Dates perhaps? Since we use both relative and absolute dates, might want to make it more friendly.
5. Meanings of Yes/No in support fields
6. Better alt-text for releaseScheduleImages.

Adding ARIA annotations for some of the above will be helpful. https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Annotations

[hugovk]

https://pagespeed.web.dev/ (also part of Lighthouse in Chrome devtools) and https://wave.webaim.org/ are useful accessibility tools.

For example, https://pagespeed.web.dev/report?url=https%3A%2F%2Fendoflife.date%2Fpython gives a score of 97 with 1 failed audit: "Links do not have a discernible name" and 10 to check manually.

And https://wave.webaim.org/report#/https://endoflife.date/python has 2 errors and 2 alerts.

[captn3m0]

The automated checks are not that helpful, we need a better review - things like Color meanings for eg, or strikethrough meaning are entirely missed.

[captn3m0]

Two issues on our theme to track:

• WCAG Compliance just-the-docs/just-the-docs#566
• Improve accessibility in docs via HTML just-the-docs/just-the-docs#870

[mattxwang]

As an FYI, in the latest patch I just cut (0.5.2) I've added better accessibility roles/features for buttons. If there are other changes you want to upstream to JtD, would love to do so - accessibility is top-of-mind for me wrt the theme.