DOCUMENTATION: Add an accessibility statement

[sturobson]

After the latest VF/UX chat I think we decided on vying for AAA where possible on new components and making sure existing things are A or AA compliant.

We should probably add some form of ‘statement’ to the docs site.

I found this example: https://www.gov.uk/government/publications/sample-accessibility-statement/sample-accessibility-statement-for-a-fictional-public-sector-website

[khawkins98]

W3C's WAI has some background and a generator that could be used:

• https://www.w3.org/WAI/planning/statements/
• https://www.w3.org/WAI/planning/statements/generator/#create

There's also a minimal example which may be good place to begin https://www.w3.org/WAI/planning/statements/minimal-example/

Also as discussed, would be good to add an "Accessibility" principle at https://latest.visual-framework.dev/guidance/, and from there we could describe a process by which sites should create their accessibility statement.

[khawkins98]

Thinking about an accessibility statement, I wonder if it would be better for this to live as part of the EMBL.org website (much like we do for the privacy statement).

[khawkins98]

Leaving this link here: https://latest.visual-framework.dev/guidance/accessibility/