Add footer and repository link, fix typo in MEGA-CHIP reference

Author: gulrak

content/reference/opcodes/dxyn.md

@@ -14,7 +14,7 @@ weight: 130
 {{< inline-svg "img/svg/op-dxyn.svg" >}}
 
 ## Available
-[CHIP-8](/reference/variants/classic-chip-8), CHIP-10, [CHIP-48](/reference/variants/chip-48), [SUPER-CHIP](/reference/variants/superchip), [MEGA-CHIP](/reference/variants/megachip), [XO-CHIP](/reference/variants/xo-chip)
+[CHIP-8](/reference/variants/classic-chip-8), CHIP-10, [CHIP-48](/reference/variants/chip-48), [SUPER-CHIP](/reference/variants/superchip), [MEGA-CHIP](/reference/variants/megachip8), [XO-CHIP](/reference/variants/xo-chip)
 
 ## Description
 

content/repository/_index.md

@@ -0,0 +1,6 @@
+---
+title: "⎋ GitHub Repo"
+weight: 100
+bookHref: "https://github.com/gulrak/chip8kb"
+bookIcon: "github"
+---

layouts/partials/docs/inject/footer.html

@@ -0,0 +1,6 @@
+<hr class="site-attrib-hr" />
+<div class="site-attrib">
+    Built with <a href="https://gohugo.io/" rel="noopener" target="_blank">Hugo</a>
+    · Theme: <a href="https://github.com/alex-shpak/hugo-book" rel="noopener" target="_blank">Hugo Book</a>
+    · chip8kb source <a href="https://github.com/gulrak/chip8kb" rel="noopener" target="_blank">on GitHub</a>
+</div>

themes/hugo-book/assets/_custom.scss

@@ -18,3 +18,18 @@ figure.align-right img {
   margin-left: auto;
   margin-right: 0;
 }
+
+.site-attrib {
+  margin-top: 0.75rem;
+  font-size: 0.9em;
+  opacity: 0.8;
+}
+
+.site-attrib a {
+  text-decoration: underline;
+}
+
+.site-attrib-hr {
+  margin: 1.5rem 0 0.75rem;
+  opacity: 0.25;
+}