SEO Improvements (#983)

* [site,seo][xs]: add custom _document with lang prop, add description to meta tags, make title larger

* [site,seo][xs]: add apple touch icon, add alt props to images

* [site,seo][xs]: add icon to default seo

* [site,seo][s]: implement next-sitemap

* [site,seo][s]: review page titles

* Rebuild package-lock.json files

* Regenerate package-lock

site/layouts/default.tsx

@@ -6,7 +6,7 @@ export default function DefaultLayout({ children, ...frontMatter }) {
           {/* Default layout */}
           {!frontMatter.layout && (
             <>
-              <h1>{frontMatter.title}</h1>
+              {!frontMatter.disableTitle && <h1>{frontMatter.title}</h1>}
               {frontMatter.author && (
                 <div className="-mt-6">
                   <p className="opacity-60 pl-1">{frontMatter.author}</p>