all: remove nix mentions

Hakurei is no longer developed on nixos, and the nix deployment method
has been removed upstream. This change updates the website to reflect
these changes.

static/index.html

@@ -82,9 +82,7 @@
 
                     <p>Official releases are available via <a
                     href="https://git.gensokyo.uk/rosa/hakurei/releases" target="_blank">Gitea
-                    </a> and documentation for the included NixOS module can be found
-                    <a href="https://git.gensokyo.uk/rosa/hakurei/src/branch/master/options.md"
-                    target="_blank">here</a>.</p>
+                    </a>.</p>
                 </section>
 
                 <section id="compatibility">
@@ -107,12 +105,6 @@
                     on the system; however, if all apps are spawned by Hakurei and the rest of the
                     system is sufficiently secured, enabling unprivileged user namespace creation
                     should not increase attack surface whatsoever.</p>
-
-                    <p>While Hakurei is primarily developed on NixOS and relies on Nix for its
-                    integration test suite, it does not target NixOS or make assumptions that are
-                    only true on NixOS. Unfortunately, mistakes do happen semi-often as the
-                    architecture of NixOS can often hide bugs and assumptions. Please <a
-                    href="/contact.html">report</a> such anomalies if you encounter them.</p>
                 </section>
             </div>
         </main>

static/install.html

@@ -36,10 +36,7 @@
 
             <p>Hakurei can be installed to almost any Linux-based operating system by running
             <code>install.sh</code> from a release tarball found <a
-            href="https://git.gensokyo.uk/rosa/hakurei/releases" target="_blank">here</a>.
-            With that said, the current easiest method for using Hakurei with desktop apps would be
-            via the <a href="https://git.gensokyo.uk/rosa/hakurei/src/branch/master/options.md"
-            target="_blank">companion NixOS module</a>.</p>
+            href="https://git.gensokyo.uk/rosa/hakurei/releases" target="_blank">here</a>.</p>
 
             <p>We strongly recommend using one of the official installation methods. Third party
             installation guides tend to be out-of-date and often contain misguided advice and