Add Gritty showcase

content/doc/showcase/gritty/index.md

@@ -0,0 +1,19 @@
+---
+title: Gritty
+subtitle: Terminal emulator written in Go and Gio
+images:
+    -
+        alt: "NeoVim in Gritty"
+        source: ./gritty-nvim.png
+    -
+        alt: "Htop in Gritty"
+        source: ./gritty-htop.png
+links:
+    -
+        title: Source
+        url: https://github.com/viktomas/gritty
+---
+Gritty is a terminal emulator that focuses on code readability.
+It's not necessarily meant for day-to-day work, but more for a
+reference for people who want to understand how terminal emulators
+work.