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doc: update styles to WCAG AAA; add accessibility statement; reword

Update to AA WCAG 2.2 contrast:
in note admonitions, link contrast was too low
in python code examples, comments were too low contrast

Added accessability statement. It is only in the tree and not linked
to the website currently.

Updated install directions for future 2.6 release. Updated paragraph
to make it clearer.

Authored by: John Rouillard 4 days ago

changed	doc/_static/style.css
added	doc/html_extra/accessibility-statement_2025-10-08.html
changed	website/www/_static/style.css
changed	website/www/index.txt