[mirotalksfu] - update docs

docs/self-hosting.md

@@ -2,9 +2,10 @@
 
 ## Requirments
 
--   Recommended: [Hetzner](https://www.hetzner.com/cloud) (`CPX11` it's enough, OS: `Ubuntu 20.04`)
--   [Node.js](https://nodejs.org/en/) at least 12x, better `16.15.1 LTS`
--   Your domain example: `your.domain.name` (Set a DNS A record for that domain that point to Your Server public IPv4)
+-   Recommended: [Hetzner](https://www.hetzner.com/cloud) (`CPX11` it's enough, OS: `Ubuntu 20.04`) use [this link](https://hetzner.cloud/?ref=XdRifCzCK3bn) to receive `€⁠20 in cloud credits`.
+-   [Node.js](https://nodejs.org/en/) at least 12x, better `16.15.1 LTS` & npm
+-   Your domain name, example: `your.domain.name`
+    -   Set a DNS A record for that domain that point to Your Server public IPv4
 
 ---