Update org-level README

[mal7othify]

First draft, open to suggestions before finalizing.

[tmhall99]

I would remove all the references to 'open-source' as that isn't really what we do. We also don't really operate as a collective imho, but @pbiggar might have thoughts on whether that works as a description.

[pbiggar]

This looks great, thanks @mal7othify! Agreed with @tmhall99 to remove "open source" from the description - we'd like to do more but we don't do that much in the open today.

Here's some wording we often use:

Tech for Palestine (“T4P”) is a coalition of thousands of founders, engineers, product marketers, investors and other professionals who are working in support of Palestinian liberation.
The T4P Incubator helps pro-Palestine advocates build, grow, and scale their work towards a Free Palestine. We support projects — whether collections of individuals, registered non-profits, or even companies — whose mission helps Palestine, especially advocacy groups building technical products or in the tech space.
The Incubator is free, and provides volunteers, marketing support, mentorship, and connections to the broader Palestinian advocacy ecosystem.

And our full set of key themes are:

• Scaling up boycotts
• Protest Tech
• Tech industry / VC divestment
• Media bias
• Reach new audiences with Pal message
• Silicon Valley / Palestine partnerships
• Bias in AI
• Exposing Hasbara