Theme: GitHub Dark Dimmed (warpdotdev#21)

* theme: add GitHub Dark Dimmed theme

* fix: add missing return

* fix: change bright black color to fg-muted

* fix: change bright black color in readme

README.md

@@ -245,6 +245,7 @@ The [Winter Holiday Theme](https://twitter.com/warpdotdev/status/147415955096184
 |**[Falcon](falcon.yaml)**:|<img src='previews/falcon.yaml.svg' width='300'>|
 |**[Flat Remix](flat_remix.yaml)**:|<img src='previews/flat_remix.yaml.svg' width='300'>|
 |**[Github Dark](github_dark.yaml)**:|<img src='previews/github_dark.yaml.svg' width='300'>|
+|**[Github Dark Dimmed](github_dark_dimmed.yaml)**:|<img src='previews/github_dark_dimmed.yaml.svg' width='300'>|
 |**[Github Light](github_light.yaml)**:|<img src='previews/github_light.yaml.svg' width='300'>|
 |**[Gotham](gotham.yaml)**:|<img src='previews/gotham.yaml.svg' width='300'>|
 |**[Green Geeko](green_geeko.yaml)**:|<img src='previews/green_geeko.yaml.svg' width='300'>|
@@ -261,7 +262,7 @@ The [Winter Holiday Theme](https://twitter.com/warpdotdev/status/147415955096184
 |**[Jellybeans](jellybeans.yaml)**:|<img src='previews/jellybeans.yaml.svg' width='300'>|
 |**[Konsole Linux](konsole_linux.yaml)**:|<img src='previews/konsole_linux.yaml.svg' width='300'>|
 |**[Low Contrast](low_contrast.yaml)**:|<img src='previews/low_contrast.yaml.svg' width='300'>|
-|**[Lucario](lucario.yaml)**:|<img src='previews/lucario.yaml.svg' width='300'>|%
+|**[Lucario](lucario.yaml)**:|<img src='previews/lucario.yaml.svg' width='300'>|
 |**[Material Theme](material_theme.yaml)**:|<img src='previews/material_theme.yaml.svg' width='300'>|
 |**[Material Theme Mod](material_theme_mod.yaml)**:|<img src='previews/material_theme_mod.yaml.svg' width='300'>|
 |**[Monokai Pro](monokai_pro.yaml)**:|<img src='previews/monokai_pro.yaml.svg' width='300'>|

github_dark_dimmed.yaml

@@ -0,0 +1,28 @@
+# Accent color for UI elements
+accent: '#F78166'
+# Terminal background color
+background: '#22272e'
+# Whether the theme is lighter or darker.
+details: darker
+# The foreground color.
+foreground: '#adbac7'
+# Ansi escape colors.
+terminal_colors:
+  bright:
+    black: '#768390'
+    blue: '#79c0ff'
+    cyan: '#b3f0ff'
+    green: '#56d364'
+    magenta: '#d2a8ff'
+    red: '#ffa198'
+    white: '#b1bac4'
+    yellow: '#e3b341'
+  normal:
+    black: '#0d1117'
+    blue: '#58a6ff'
+    cyan: '#76e3ea'
+    green: '#3fb950'
+    magenta: '#bc8cff'
+    red: '#ff7b72'
+    white: '#b1bac4'
+    yellow: '#d29922'