feat: Added Elestio as one-click deploy option

[kaiwalyakoparkar]

Fixes #28184

Checklist

• [ ] Tests written for new code (and old code if feasible).
• [ ] New or updated public/exported symbols have accurate TSDoc documentation.
• [ ] Linter and other CI checks pass.
• [x] Sign-off given on the changes (see CONTRIBUTING.md).

[CLAassistant]

All committers have signed the CLA.

[ara4n]

@kaiwalyakoparkar I may be missing something, but can you explain why we'd want to promote an deployment service which competes with Element's own offering (https://ems-docs.element.io/books/element-cloud-documentation/page/how-to-get-an-ems-server), but doesn't appear to financially support Element or Matrix development?

[t3chguy]

@ara4n they did offer a revenue share: https://github.com/element-hq/element-web/issues/28184#issue-2581369010

[ara4n]

ah, had totally missed that.

[dbkr]

Hello! I believe someone from the appropriate team should have reached out to you regarding this. I'm going to close this for now until we hear back from that team.