Bridge December update: v3.3.0

[thelifeandtimes]

This PR was originally opened for the purpose of for making more robust improvements to Bridge. Given that the current Bridge codebase is so messy, and the landscape of Azimuth (and Urbit ID more broadly) management is diversifying, we are going a different route. The new approach is to slowly deprecate bridge instead, closing off routes to broken features (e.g. transaction history) and route to other Urbit ID management interfaces (e.g. network.urbit.org).*

Other options (will) include:
Perigee - Self-hostable interface for Azimuth (L1 and L2) written in Go, from Native Planet (hosted version coming soon to perigee.urbit.org)
Etherscan - General purpose block explorer which can readily interact with L1 Azimuth actions
Neoscape/Zodiac - COMING SOON (L1 points only)
Urbit.Box|house - COMING SOON (L1 points only)
Zenith - COMING SOON (L1 and L2; UX Changes TBD, likely only to impact Stars & Galaxies)
These other systems may support more streamlined flows, specified UX affordances, or security considerations, but the purpose of Bridge is to support the baseline functionality of both L1 and L2 Azimuth points to the extent that they interact with Urbit OS.

The purpose here is to make sure that the core flows of Azimuth actions are supported and maintained across the supported wallets, point types, and consensus mechanisms (Mainnet Ethereum, L2 Naive Rollup).

As such, this PR makes basic updates to begin pointing in this direction, fixing basic messaging and adding initial notices alluding to functionality being deprecated.

dev environment setup

• Updated DEVELOPMENT.md to ensure L2 roller setup commands are up to date.

Updates included close the following Issues:

• Greetings text always talks about master ticket regardless of login method #391
• home screen says "migrate-spawn" when moving L1 star spawn proxy to L2 #930
• Broken link on Bridge home screen #1031
• ux: recalculate estimated L2 migration fee #1056
• Network keys set / not set - confusing error message screen #1071
• Redirect bridge.urbit.org/activate to the main page. #1137 -- @pkova I'm not sure where exactly this is running, but can you set up a redirect for this when you push it live?
• Updated Privacy Policy to cover both Tlon and The Urbit Foundation

PRs to merged in and include in release:

• Fix #1141 - L1 spawn issues #1143
• L2 migration wording fix #1127

Functionality Removed/Modified and Rationale

• Remove recovery phrase pathway from bridge.urbit.org hosted version (recommend user to Metamask path, as typing your seed phrase into the browser is bad.) Aborted due to recovery phrase usage being the default testing flow, retained for the time being.
• Invite Codes include Tlon onboarding link and related interstitial explaining the lay of the land if something breaks
• Invite code generation will route to 'spawn to an address' flow.
• Notice on Safari that Chrome/Brave are recommended
• History button leads to dysfunctional transaction history, remove it.