Big update in light of Lockup merger

[PaulRBerg]

In Lockup V2.0.0, we have decided to merge the LockupLinear, LockupTranched, and LockupDynamic contracts. Context here: sablier-labs/lockup#1064

Many parts of the docs will have to be updated.

[smol-ninja]

Should we have three categories in reference section: lockup, airdrops and flow? Preview here.

[andreivladbrg]

Should we have three categories in reference section: lockup, airdrops and flow? Preview here.

IMO we should have 3 diferent sections.

[razgraf]

Posting here from Slack (some of the things are probably already done, but just making sure)

• Lockup merged and all the examples
• Definitions and examples of cliff streams that isn't ratio-based now
• A note under shapes like Unlock Cliff and Unlock Linear that they can now be done using either LL or LD
• Instant / ranged airdrops
• Fees (I need a good explainer page for this so I can link to it from the app in the places we charge fees for)

Also, the App and API sections might have mentions to "different contracts" when discussing LL/LD/LT - now that we have the monolithic architecture, could you have a look over those areas as well? I'll add a reminder in our own list of pre-launch tasks as well.

[smol-ninja]

Some of the content on "Use Cases" page will become outdated after we launch Merkle Instant. It is not a good idea to scream the flaws of the instant airdrops anymore. I have replaced the criticizing section with the benefits of using Sablier to run instant airdrop campaigns: https://docs-jnmtlsx7x-sablier.vercel.app/concepts/use-cases.

@maxdesalle whenever you have time, can you look over the content and make it better please? Thank you.