Updated the website

[Andrew van der Stock]

Hi Board,

as part of the new website update, I realized that the current site could be updated a bit along the lines that I have in mind. So I've:

- Added the GenAI and CycloneDX projects to the Project main menu, along with a Contribute to a project menu item that takes you to OWASP Nest

- Fixed up the Call to Actions in the Corporate Supporter page to clearly show how Corporate Supporters can support us directly 

- Removed a few defunct pages, like the 2022 Corporate Supporter migration plan, and menu items from the About menu

I'll transfer the staff procedures to an internal document repository and get those edited as part of our Control and Processes update required by the external auditors.

thanks,

Andrew