💥 Remove :feature category

:feature was a "catch-all" category. Many of its modules fit better in
other categories, so they've been moved:

- feature/debugger -> tools/debugger
- feature/evil -> editor/evil
- feature/eval -> tools/eval
- feature/lookup -> tools/lookup
- feature/snippets -> editor/snippets
- feature/file-templates -> editor/file-templates
- feature/workspaces -> ui/workspaces

More potential changes in the future:

- A new :term category for terminal emulation modules (eshell, term and
  vterm).
- A new :os category for modules dedicated to os-specific functionality.
  The :tools macos module would fit here, but so would modules for nixos
  and arch.
- A new :services category for web-service integration, like wakatime,
  twitter, elfeed, gist and pastebin services.

modules/tools/lookup/autoload/evil.el

@@ -0,0 +1,22 @@
+;;; tools/lookup/autoload/evil.el -*- lexical-binding: t; -*-
+;;;###if (featurep! :editor evil)
+
+;;;###autoload (autoload '+lookup:online "tools/lookup/autoload/evil" nil t)
+(evil-define-command +lookup:online (query &optional bang)
+  "Look up QUERY online. Will prompt for search engine the first time, then
+reuse it on consecutive uses of this command. If BANG, always prompt for search
+engine."
+  (interactive "<a><!>")
+  (+lookup/online query (+lookup--online-provider bang 'evil-ex)))
+
+;;;###autoload (autoload '+lookup:dash "tools/lookup/autoload/evil" nil t)
+(evil-define-command +lookup:dash (query &optional bang)
+  "Look up QUERY in your dash docsets. If BANG, prompt to select a docset (and
+install it if necessary)."
+  (interactive "<a><!>")
+  (let (selected)
+    (when bang
+      (setq selected (helm-dash-read-docset "Select docset" (helm-dash-official-docsets)))
+      (unless (+lookup-docset-installed-p selected)
+        (+lookup/install-docset selected)))
+    (+lookup/in-docsets query (or selected (+lookup-docsets-for-buffer)))))