docs: delete /sdks/community page

This page was more or less a duplicate of the final section of the
SDK overview. I've moved the section on implementing your own SDK into
the SDK overview instead.

website/docs/sdks/index.md

@@ -112,3 +112,10 @@ Here's some of the fantastic work our community has done to make Unleash work in
 - [AppsFlyer/clojure-unleash](https://github.com/AppsFlyer/unleash-client-clojure) (Clojure)
 - [pmb0/nestjs-unleash](https://github.com/pmb0/nestjs-unleash) (NestJS - Node.js)
 - _...your implementation for your favorite language._
+
+### Implement your own SDK {#implement-your-own-sdk}
+
+If you can't find an SDK that fits your need, you can also develop your own SDK. To make implementation easier, check out these resources:
+
+- [Unleash Client Specifications](https://github.com/Unleash/client-specification) - Used by all official SDKs to make sure they behave correctly across different language implementations. This lets us verify that a gradual rollout to 10% of the users would affect the same users regardless of which SDK you're using.
+- [Client SDK overview](../client-specification) - A brief, overall guide of the _Unleash Architecture_ and important aspects of the SDK role in it all.

website/sidebars.js

@@ -41,7 +41,6 @@ module.exports = {
             'sdks/proxy-javascript',
             'sdks/proxy-react',
             'sdks/proxy-ios',
-            'sdks/community',
         ],
         Addons: [
             'addons/index',