Transfer deployment guides to external resources

[pwizla]

This PR:

• transfers the 3rd-party deployment guides to the https://strapi.io website
• transfers more technical guides (proxying, PM2) to the forum
• updates deployment pages and some other related pages accordingly

To do:

• [x] set up Vercel redirections for deleted files

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 9, 2024 9:48am