[site,seo][s]: add description metadata to main pages

site/content/config.js

@@ -1,7 +1,7 @@
 const config = {
   title: 'PortalJS - The JavaScript framework for data portals.',
   description:
-    'PortalJS is a framework for rapidly building rich data portal frontends using a modern frontend approach.',
+    'PortalJS is a JavaScript framework for rapidly building rich data portal frontends using a modern frontend approach.',
   theme: {
     default: 'dark',
     toggleIcon: '/images/theme-button.svg',

site/content/docs/index.md

@@ -1,6 +1,7 @@
-<NextSeo title="Getting Started - PortalJS" />
-
-# Getting Started
+---
+title: Getting Started
+description: "Getting started guide and tutorial about data portal-building with PortalJS"
+---
 
 Welcome to the PortalJS documentation!
 
@@ -53,6 +54,6 @@ After refreshing the page, you should see the new text:
 
 <img src="/assets/docs/editing-the-page-1.png" />
 
-Congratulations! The app is up and running and you learned how to edit a page. In the next lesson, you are going to learn how to create new datasets. 
+Congratulations! The app is up and running and you learned how to edit a page. In the next lesson, you are going to learn how to create new datasets.
 
 <DocsPagination next="/docs/creating-new-datasets" />

site/content/guide/index.md

@@ -3,6 +3,7 @@ showToc: false
 showSidebar: false
 title: "Markdown-based Websites Guide"
 disableTitle: true
+description: Create markdown-based websites and data portals, update it, add collaborators and discover markdown superpowers with Flowershow and PortalJS
 ---
 
 <Hero title="Markdown-based Websites" subtitle="Create markdown-based website, update it, add collaborators and discover markdown superpowers" />

site/content/howtos/index.md

@@ -1,5 +1,6 @@
 ---
 title: Guides and Tutorials
+description: Learn more about how you can achieve different data portal features with PortalJS
 ---
 
 - [[howtos/analytics|How to add web analytics?]]