WIP: Improve paragraph contrast on Connectors page - #82377

What?

Closes #82329.

Updates the bottom paragraph text colour on the Connectors page from #949494 to #757575.

Why?

The previous paragraph colour did not provide sufficient contrast against the white page background for normal text.

The updated colour matches the similar paragraph treatment used on the Fonts page and meets the minimum contrast requirement against white.

How?

Changes the .connectors-page > p color token from $gray-600 to $gray-700.

Testing Instructions

1. Go to Settings > Connectors.
2. Find the paragraph at the bottom of the page that starts with "If the connector you need is not listed".
3. Confirm the paragraph text is readable and uses the darker gray color.
4. Inspect the paragraph text and confirm its computed color is #757575 / rgb(117, 117, 117).

Testing Instructions for Keyboard

1. Go to Settings > Connectors.
2. Press Tab until focus reaches the "search the plugin directory" link in the bottom paragraph.
3. Confirm the link can be reached and activated using the keyboard.
4. Confirm keyboard navigation on the page still works as expected.

Screenshots or screencast

Before	After
Paragraph text used #949494.	Paragraph text uses #757575.

Use of AI Tools

This fix was created with assistance from Copilot using GPT 5.5. I reviewed and tested the generated changes.