💥 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/lang/ledger/config.el

@@ -26,7 +26,7 @@
 
 
 (def-package! evil-ledger
-  :when (featurep! :feature evil +everywhere)
+  :when (featurep! :editor evil +everywhere)
   :hook (ledger-mode . evil-ledger-mode)
   :config
   (set-evil-initial-state! 'ledger-report-mode 'normal)

modules/lang/ledger/packages.el

@@ -3,7 +3,7 @@
 
 (package! ledger-mode)
 
-(when (featurep! :feature evil)
+(when (featurep! :editor evil)
   (package! evil-ledger))
 
 (when (featurep! :tools flycheck)