Update the website layout with narrower default width and better typography (#1753)

- Reduces the default width from 1600px to 1200px of the web page and reduce the size of various elements and text. This fixes the problem that I designed the website assuming everyone is viewing from the same 2560px wide screen as I used to design it, which is a bad assumption. Most websites are around the 1200px mark.
- Removes the use of the EB Garamond font, replacing more headers with a bold Inter instead, leaving only Bona Nova for h1 headers at the tops of pages (except the home page, which might have further revamp soon).
- Adds nice flavor graphics to a redesigned volunteer page.
- Cleans up and organizes the Zola templating code and CSS style sheets.
- Improves image carousel to fade out images when dragged past the start or end.

website/templates/404.html

@@ -6,11 +6,11 @@
 
 {%- block content -%}
 <section id="404">
-	<div class="section">
+	<div class="block">
 		<h1>Page not found</h1>
 		<p>Or as the machines like to say it: <code>404</code>.</p>
 		<br />
-		<a href="/" class="button arrow">Home Page</a>
+		<a href="/" class="button arrow">Return home</a>
 	</div>
 </section>
 {%- endblock content -%}