Update ArchLinux instructions

Nyx has been removed from the community maintained AUR repository, and moved to the official ArchLinux repos. As sucn updating our links and installation instructions. [1] https://aur.archlinux.org/packages/nyx/ [2] https://www.archlinux.org/packages/community/any/nyx/

Update ArchLinux instructions
f14cf44c · Damian Johnson · 2e054722 · f14cf44c
Commit f14cf44c authored Nov 18, 2018 by Damian Johnson
--- a/web/index.html
+++ b/web/index.html
@@ -411,13 +411,11 @@ sudo python setup.py install</pre><br></li>
      </div>

      <div class="platform">
-        <a href="https://aur.archlinux.org/packages/nyx/" id="archlinux"><img src="images/download/archlinux.png" alt="Arch Linux"></a>
-        <a href="https://aur.archlinux.org/packages/nyx/" class="platform-title">Arch Linux</a>
-        <p>Package by Alex for <a href="https://wiki.archlinux.org/index.php/AUR#Installing_packages">Arch Linux</a>.</p>
+        <a href="https://www.archlinux.org/packages/community/any/nyx/" id="archlinux"><img src="images/download/archlinux.png" alt="Arch Linux"></a>
+        <a href="https://www.archlinux.org/packages/community/any/nyx/" class="platform-title">Arch Linux</a>
+        <p>Package by Alex for Arch Linux...</p>
        <pre>
-% wget https://aur.archlinux.org/cgit/aur.git/snapshot/nyx.tar.gz
-% tar -xvf nyx.tar.gz
-% cd nyx; makepkg --install
+% pacman -S nyx
 </pre>
      </div>