Add deployment pattern recommendations

[aefhm]

Description

Add technical notes on proxies.

Relates to oasisprotocol/docs#818.

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[matevz]

Do you think we should rather rename the chapter to upgradable.md? I can't get rid of a feeling that the chapter is about setting up oracles or paymasters or proxy nodes at first glance when I see the "Proxies" title. The "Upgradable Contracts" is the title I think it rings the right bell for firstcomers.

[aefhm]

Do you think we should rather rename the chapter to upgradable.md? I can't get rid of a feeling that the chapter is about setting up oracles or paymasters or proxy nodes at first glance when I see the "Proxies" title. The "Upgradable Contracts" is the title I think it rings the right bell for firstcomers.

I kind of want to 🤔. I hear you on the notion of proxy nodes. My concern with "Upgradeable Contracts" would be that the deterministic deploys are "Clones" so to speak with regards to OpenZeppelin terminology. Perhaps "Deployment Customization" or "Upgradable and Deterministic Contracts" can unify both sections? Or how about "Deployment Patterns?"

[matevz]

Excellent!