feat: add github style

Signed-off-by: Matej Focko <me@mfocko.xyz>

README.md

@@ -2,6 +2,7 @@
 
 ## List of available styles
 
+* [github](./github.user.css)
 * [gitlab](./gitlab.user.css)
 * [ismu](./ismu.user.css)
 * [jira](./jira.user.css)

github.user.css

@@ -0,0 +1,103 @@
+/* ==UserStyle==
+@name           GitHub
+@namespace      git.mfocko.xyz/mfocko/usercss
+@updateURL      https://git.mfocko.xyz/mfocko/usercss/raw/branch/main/github.user.css
+@version        1.7.10
+@description    Switch monospace font and hide clutter.
+@author         mfocko <me@mfocko.xyz>
+@preprocessor   stylus
+@var select monospace-font "Font" [
+    "custom*",
+    "Berkeley Mono Variable",
+    "Cascadia Code NF",
+    "Comic Code Ligatures",
+    "Fira Code",
+    "Hack",
+    "IBM Plex Mono",
+    "Iosevka Term",
+    "Iosevka Term Slab",
+    "Iosevka Comfy",
+    "Pragmasevka",
+    "JetBrains Mono",
+    "JuliaMono",
+    "MonoLisa Variable",
+    "PragmataPro Liga",
+    "PragmataPro Mono Liga",
+    "Rec Mono Linear",
+    "Roboto Mono",
+    "SF Mono",
+    "Source Code Pro",
+    "Victor Mono",
+]
+@var text custom-font "Custom font" "monospace"
+@var checkbox monospace-comments "Render comments in monospace font" 0
+@var checkbox all-the-way "Render everything in monospace font" 0
+@var text font-features "Font feature settings" "'calt' on, 'liga' on, 'dlig' on"
+
+@var checkbox hide-header "Hide header" 0
+@var checkbox hide-description-of-board-columns "Hide description of the board columns" 0
+==/UserStyle== */
+
+if monospace-font=="custom"
+    monospace-font=custom-font
+
+@-moz-document domain("github.com"),
+domain("githubusercontent.com") {
+    :root {
+        --fontStack-monospace: monospace-font;
+    }
+    
+    pre,
+    code,
+    kbd,
+    var,
+    tt,
+    .blob-code-inner,
+    .file-info,
+    .text-mono,
+    .commit-ref,
+    .blob-num,
+    .branch-name,
+    .commit .sha-block,
+    .commit .sha,
+    textarea,
+    .input-monospace,
+    .commit-tease-sha,
+    .react-code-text,
+    .react-blob-print-hide,
+    * [style *="monospace"],
+    .RyhEW,
+    .bMtKSj /* commit hash in the project view of issue */ {
+        font-family: monospace-font !important;
+        font-feature-settings: font-features;
+    }
+    
+    if monospace-comments {
+        .comment-body {
+            font-family: monospace-font !important;
+            font-feature-settings: font-features;
+        }
+    }
+    
+    if all-the-way {
+        * {
+            font-family: monospace-font !important;
+            font-feature-settings: font-features;
+        }
+    }
+    
+    if hide-header {
+        /* hide the header */
+        .AppHeader {
+            display: none;
+        }
+    }
+    
+    if hide-description-of-board-columns {
+        .buxasC, .bVaayg, .VwkZl, .eTJVOt, .dWilAV, .iYtFrB, .haRXvJ,
+        .eUPYPv,
+        .fzxeh {
+            display: none;
+        }
+    }
+}