Fix broken link

website/i18n/en.json

@@ -74,13 +74,14 @@
     "Backend": "Backend",
     "Misc": "Misc",
     "Developing a feature": "Developing a feature",
-    "HASS Core methods": "HASS Core methods",
+    "Development 101": "Development 101",
     "Creating Platforms": "Creating Platforms",
     "Creating Components": "Creating Components",
     "External API": "External API",
     "Internationalization": "Internationalization",
     "Intents": "Intents",
     "asyncio": "asyncio",
+    "Hass.io Add-Ons": "Hass.io Add-Ons",
     "Maintainer docs": "Maintainer docs"
   },
   "pages-strings": {

website/pages/en/index.js

@@ -56,7 +56,7 @@ const PopularTopicsSection = ({ language }) => (
         <div style={{ display: "flex", flexDirection: "column" }}>
           <h2>Popular topics</h2>
           <ul style={{ flex: "1" }}>
-          <li><a href={docUrl("building_integrations", language)}>
+          <li><a href={docUrl("development_index", language)}>
               Add a new integration
             </a></li>
             <li><a href={docUrl("internationalization_index", language)}>

website/siteConfig.js

@@ -56,7 +56,7 @@ const siteConfig = {
   /* colors for website */
   colors: {
     primaryColor: '#03A9F4',
-    secondaryColor: '#ff9800',
+    secondaryColor: '#4FC3F7',
   },
 
   /* custom fonts for website */