Remove most mentions of pmOS / make them optional

src/homepage/bottom.html

@@ -0,0 +1,33 @@
+	<p class="text">
+		This is the desktop version of Firefox, but with a
+		<a href="https://postmarketos.org/firefox-cfg">
+			mobile-friendly configuration</a>. Try zooming and
+		scrolling with your fingers!
+	</p>
+	<h2>How to install add-ons</h2>
+	<p class="text">
+	Use the official
+	<a href="https://addons.mozilla.org/en-US/android/">add-on website</a>
+	from Mozilla. Take care, some add-ons require a lot of access to your
+	data and may not be respectful of your privacy. Here is a free software
+	add-on that we trust:
+	</p>
+	<ul>
+		<li> <a href="https://addons.mozilla.org/en-US/android/addon/ublock-origin/">uBlock Origin</a>:
+			a wide-spectrum content blocker, that prevents most
+			websites from wasting <i>your</i> resources (time,
+			traffic, battery, CPU and RAM).
+	</ul>
+
+	<h2>How to change settings</h2>
+	<p class="text">
+	Read on to set a different homepage, search engine or change other
+	options. Tap the collapsed menu icon on the top right, then select
+	<i>Preferences</i>. Tap the same icon again and decrease the
+	<i>Zoom</i> level to <i>50%</i>, so the page becomes readable. Next,
+	tap the category of the setting you want to change on the left &mdash;
+	house for <i>Homepage</i>, magnifying glass for <i>Search</i>. Finally,
+	change the desired setting on the right.
+	</p>
+</body>
+</html>