Theme: better bottom links

- Add links to gemini versions of HTML pages
- Fix footer link color

Also snuck in removal of scrollbar coloring. Why was that there in the
first place?

themes/etch-custom/assets/css/dark.css

@@ -1,9 +1,6 @@
 {{ if not (eq .Site.Params.dark "on") -}}
 @media (prefers-color-scheme: dark) {
 {{ end -}}
-html {
-    scrollbar-color: #6c6c6c #2e2e2e;
-}
 
 body {
     color: #ebebeb;
@@ -19,7 +16,7 @@ header#banner nav ul li a {
     color: #cccccc;
 }
 
-main#content a {
+main#content a, footer a {
     color: #00b1ed;
 }
 

themes/etch-custom/assets/css/main.css

@@ -58,7 +58,7 @@ header#banner nav ul li a {
     color: #454545;
 }
 
-main#content a {
+main#content a, footer a {
     color: #007dfa;
     text-decoration: none;
 }

themes/etch-custom/layouts/_default/single.html

@@ -8,4 +8,10 @@
     </header>
     {{- .Content -}}
 </article>
+<section class="comment">
+  {{ with .OutputFormats.Get "gemtext" }}
+  <p>
+  ⇒ View this article on <a href="{{replace .Permalink "/gemini" "" 1 | safeURL}}">my Gemini capsule</a>.
+  {{ end }}
+
 {{ end }}