Update versions

Author: MaedahBatool

docs.config.js

@@ -1,5 +1,5 @@
 const config = {
-	DOCS_LATEST_VERSION: '5.8'
+	DOCS_LATEST_VERSION: '5.9'
 };
 
 module.exports = config;

docs/legacy.mdx

@@ -4,6 +4,7 @@
 
 <Accordion title="Sourcegraph 5.X">
 
+  - [5.8](https://5.8.sourcegraph.com/)
   - [5.7](https://5.7.sourcegraph.com/)
   - [5.6](https://5.6.sourcegraph.com/)
   - [5.5](https://5.5.sourcegraph.com/)

src/data/versions.ts

@@ -15,8 +15,8 @@ export const versions: VersionI[] = [
         url: '/',
     },
     {
-        name: 'v5.7',
-        url: 'https://5.7.sourcegraph.com/'
+        name: 'v5.8',
+        url: 'https://5.8.sourcegraph.com/'
     },
 ];