Idea bank call to action + minor content updates

[Niyousha99]

Replaced "mailing list" call to actions with our link tree.

Updated project team logos.

Added idea submission call to action on project page.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 1d8f5a7):

https://tech-start-website--pr429-idea-bank-r6pljm12.web.app

_{(expires Thu, 13 Apr 2023 20:23:36 GMT)}

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_{Sign: 9f66df0a945e38b46b17e8f8ce277dc838cba8f2}

[racherene]

Looks good!