Added JSR and fixed link to v4 guides (#1055)

Author: taras

docs/installation.mdx

@@ -15,10 +15,10 @@ yarn add effection
 
 ## Deno
 
-Effection has first class support for Deno because it is developed with [Deno](https://deno.land). Releases are published to [https://deno.land/x/effection](https://deno.land/x/effection). For example, to import the `main()` function:
+Effection has first class support for Deno because it is developed with [Deno](https://deno.land). Releases are published to [JSR](https://jsr.io/@effection/effection) and [https://deno.land/x/effection](https://deno.land/x/effection). For example, to import the `main()` function:
 
 ```ts
-import { main } from "jsr:@effection/[email protected]-beta.2";
+import { main } from "jsr:@effection/[email protected]";
 ```
 
 > 💡 If you're curious how we keep NPM/YARN and Deno packages in-sync, you can [checkout the blog post on how publish Deno packages to NPM.][deno-npm-publish].

www/routes/guides-route.tsx

@@ -176,7 +176,7 @@ export function guidesRoute({
                     href={yield* createRootUrl("docs")(page.id)}
                     class="font-medium text-sky-500 hover:underline"
                   >
-                    View ${current} docs →
+                    View {current} docs →
                   </a>
                 </div>
               ) : (