Improve webpage and docs meta information (#942)

## Description

Improve webpage and docs meta information

## Type of change

- [x] 🐹 Trivial/Minor

## Test Plan

<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual

docs/src/pages/index.js

@@ -30,7 +30,7 @@ export default function Home() {
   return (
     <Layout
       title={`${siteConfig.title}`}
-      description="Documentation for the Corso backup tool">
+      description="Documentation for Corso, a free, secure, and open-source backup tool for Microsoft 365">
       <HomepageHeader />
       <main>
         <HomepageFeatures />

website/src/partials/title-meta.html

@@ -1,7 +1,7 @@
 <meta charset="UTF-8" />
 <title>@@title - Free, Secure, Open-Source Backup for M365</title>
 <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
-<meta content="Corso Backup for M365" name="description" />
+<meta content="Corso, a free, secure, and open-source backup tool for Microsoft 365" name="description" />
 <meta name="author" content="The Corso Backup Team" />
 <meta name="website" content="https://corsobackup.io" />
 <meta name="version" content="1.0.0" />