Fix Accessibility Violations for RSS Button and Theme Toggle

[huangkevin-apr]

Description

• Adding new page
• Updating existing documentation
• Other updates

This PR fixes two accessibility violations identified by IBM Equal Access Checker:

• RSS button missing accessible name (a_text_purpose violation)
• Theme toggle button missing label (input_label_exists violation)

These violations affect users relying on assistive technologies like screen readers, as the buttons lack proper labels to convey their purpose.

Issue Description

When running IBM Accessibility Checker (Version 4.0.9) on the website, 2 accessibility violations were reported.

1) RSS button missing accessible name (a_text_purpose violation)

Why is this important?
When the purpose of a link is clear users can easily navigate links on the page without having to see the surrounding information for context.

2) Theme toggle button missing label (input_label_exists violation)

Why is this important?
Associating a meaningful label with every UI control allows the browser and assistive technology to expose and announce the control to a user. Associating a visible label also provides a larger clickable area.

Fix Description

RSS Button (components/geistdocs/rss-button.tsx)

• Added aria-label="RSS Feed" to provide an accessible name for the link
• Added title="RSS Feed" to provide a tooltip for mouse users
• The RSS icon already has proper ARIA markup and remains unchanged

Theme Toggle (components/geistdocs/theme-toggle.tsx)

• Added aria-label="Toggle theme" to the loading state button
• Added dynamic aria-label to the interactive button that updates based on current theme:
  "Switch to light mode" when in dark mode
  "Switch to dark mode" when in light mode
• This provides clear context about what action the button will perform

Screenshot of Patched Website

The patch submitted in this PR was generated by A11YRepair, an automated Web Accessibility repair tool that I developed to address common accessibility violations in web applications. The generated fixes were manually reviewed and validated before submission.

WCAG Compliance

These changes address the following WCAG Success Criteria:

• 2.4.4 Link Purpose (In Context) - Level A
• 4.1.2 Name, Role, Value - Level A

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