Re-arrange content on torproject.org/about/membership

@lavamind, I was planning to ask if it's easy to change the order of the text on the membership page, and now we're on a roll making it look nicer, I might as well file my ticket 😄. In particular, we've had members comment that they don't know where their logo is and that it's hard to find, so I want to push them closer to the top.

Could we:

• Move the "Show your support for privacy online," "Membership Tiers," and "Community is at the heart of the Tor Project Membership Program, and our members agree to join our community. As such, Members agree to adhere to Tor’s Code of Conduct, Social Contract, and our Statement of Values" text blocks to BELOW the list of members
• Move the "Become a Member" text block to ABOVE the list of members

Let me know if this is possible!

In the future, I'd like to more significantly combine the /membership and /sponsors pages, but this is a good fix for now.