dev(ci): use doomemacs/ci commit linter

And move repo-specific linter config into .github/ci.el

.github/ci.el

@@ -0,0 +1,35 @@
+;;; ci.el -*- lexical-binding: t; no-byte-compile: t; -*-
+;;; Commentary:
+;;; Code:
+
+;;; Types
+(add-to-list 'doom-cli-commit-types 'module)
+(add-to-list 'doom-cli-commit-scopeless-types 'module)
+
+
+;;; Scopes
+(add-to-list 'doom-cli-commit-scopes "cli")
+(add-to-list 'doom-cli-commit-scopes "lib")
+(add-to-list 'doom-cli-commit-scopes "docs")
+(add-to-list 'doom-cli-commit-scopes #'ci-module-scope)
+(add-to-list 'doom-cli-commit-scopes #'ci-docs-scope)
+
+
+;;; Helpers
+(cl-defun ci-module-scope (scope (&key type))
+  "Only allow :CATEGORY or MODULE scopes if they actually exist."
+  (seq-find (doom-rpartial
+             #'doom-glob (if (string-prefix-p ":" scope)
+                             (format "%s" (substring scope 1))
+                           (format "*/%s" scope)))
+            doom-modules-dirs))
+
+(cl-defun ci-docs-scope (scope (&key type))
+  "Allow any filename in docs/* as a scope for docs commits."
+  (when (eq type 'docs)
+    (member scope
+            (cons "install"
+                  (mapcar #'file-name-base
+                          (doom-glob doom-docs-dir "*.org"))))))
+
+;;; ci.el ends here