Simplify docs and remove Docker local setup (#4783)

Having 2 different dev setups caused confusion, let's remove the Docker
local setup and recommend people install yarn locally.

Also simplified some docs by merging pages together, the recommend
self-hosting option is now the docker-compose / to adapt the
docker-compose.

packages/twenty-docs/docs/start/self-hosting/cloud-providers.mdx

@@ -1,6 +1,6 @@
 ---
-title: Cloud providers
-sidebar_position: 2
+title: Vendor-specific instructions
+sidebar_position: 3
 sidebar_custom_props:
   icon: TbCloud
 ---
@@ -10,10 +10,15 @@ This document is maintained by the community. It might contain issues.
 Feel free to join our discord if you need assistance.
 :::
 
-## Available cloud providers
 
-- [Azure Container Apps](#azure-container-apps)
-- [Others](#others)
+## Render
+
+[![Deploy to Render](https://render.com/images/deploy-to-render-button.svg)](https://render.com/deploy?repo=https://github.com/twentyhq/twenty)
+
+## RepoCloud
+
+[![Deploy on RepoCloud](https://d16t0pc4846x52.cloudfront.net/deploy.png)](https://repocloud.io/details/?app_id=259)
+
 
 ## Azure Container Apps