chore: fix up links and add CTA in README

[skip ci]

README.md

@@ -1,8 +1,8 @@
 ![gogs-brand](https://user-images.githubusercontent.com/2946214/146899259-6a8b58ad-8d6e-40d2-ab02-79dc6aadabbf.png)
 
-[![GitHub Workflow Status](https://img.shields.io/github/checks-status/gogs/gogs/main?logo=github&style=for-the-badge)](https://github.com/gogs/gogs/actions?query=branch%3Amain) [![Discord](https://img.shields.io/discord/382595433060499458.svg?style=for-the-badge&logo=discord)](https://discord.gg/9aqdHU7) [![Sourcegraph](https://img.shields.io/badge/view%20on-Sourcegraph-brightgreen.svg?style=for-the-badge&logo=sourcegraph)](https://sourcegraph.com/github.com/gogs/gogs)
+[![GitHub Workflow Status](https://img.shields.io/github/checks-status/gogs/gogs/main?logo=github&style=for-the-badge)](https://github.com/gogs/gogs/actions?query=branch%3Amain) [![Sourcegraph](https://img.shields.io/badge/view%20on-Sourcegraph-brightgreen.svg?style=for-the-badge&logo=sourcegraph)](https://sourcegraph.com/github.com/gogs/gogs)
 
-[简体中文](README_ZH.md)
+👉 Deploy on DigitalOcean and [get $200 in free credits](https://m.do.co/c/5aeb02268b55)!
 
 ## 🔮 Vision
 
@@ -86,7 +86,7 @@ There are 6 ways to install Gogs:
 
 <p>This project is proudly supported by:</p>
 <p>
-  <a href="https://www.digitalocean.com/">
+  <a href="https://m.do.co/c/5aeb02268b55">
     <img src="https://opensource.nyc3.cdn.digitaloceanspaces.com/attribution/assets/SVG/DO_Logo_horizontal_blue.svg" width="201px">
   </a>
 </p>
@@ -95,7 +95,6 @@ Other acknowledgments:
 
 - Thanks [Egon Elbre](https://twitter.com/egonelbre) for designing the original version of the logo.
 - Thanks [Crowdin](https://crowdin.com/project/gogs) for sponsoring open source translation plan.
-- Thanks [MonoVM](https://monovm.com/linux-vps/) for sponsoring VPS services.
 - Thanks [Buildkite](https://buildkite.com) for sponsoring open source CI/CD plan.
 
 ## 👋 Contributors