dApp docs update

[bbenligiray]

Closes #138

@Ashar2shahid @RiVal-cz for visibility

• I extended the Quickstart and Using API3 Market sections to mention the new "Skip OEV Rewards"/"Earn OEV Rewards" interface on the Integrate page
• I stopped using "communal" and "dApp-specific" for proxies, referred to the "Skip OEV Rewards"/"Earn OEV Rewards" interface wherever possible. They are in some @api3/contracts function names so I couldn't remove it altogether (it's not a big deal imo).
• I removed the manual proxy deployment section, considering that even the self-service OEV user doesn't need it anymore
• I removed all references to a dApp alias. The dApp "applies for OEV Rewards" and we "register" them, which makes them show up on the Integrate page of the market. They get assigned an alias during the registration but they don't need to know much about this. The only point they hear about this is when they run the @api3/contracts CLI command, which is arguably not needed anymore (you can just send them Market links for each proxy), and Ashar gives them the command including the arguments so they don't need to know their alias. (Previously the alias was important for the self-service OEV user because they used it to deploy their proxies manually.)

I didn't address @Siegrift 's concerns about not documenting what exactly constitutes the total OEV Rewards number because the docs currently don't refer to this number in any way. Once that goes up on api3.org, I'm planning to add a section discussing that under the OEV Rewards section.

[github-actions]

Visit the preview URL for this PR (updated for commit ef50830):

https://oev-docs--pr156-dapp-docs-update-qe9drfbu.web.app

_{(expires Sun, 16 Feb 2025 16:28:52 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 6915b094b5ba83fde754632ba50c1ee9406d433f}

[Siegrift]

It would make sense to mention that switching later is not a problem.

[bbenligiray]

That will just cause them to skip OEV Rewards and it will be a pain to have them switch later on