tools/gist: open gists in non-popups

- Removes +gist/kill-cache (gist-list and gist-list-user with a
  universal argument already does this).
- Removes +gist/open-current. No longer necessary when gists aren't
  opened in popups.
- Makes keybinds more consistent with other "porcelains", like elfeed's
  or magit.

modules/config/default/+evil-bindings.el

@@ -467,14 +467,13 @@
       (:when (featurep! :tools gist)
         :after gist
         :map gist-list-menu-mode-map
-        :n "RET"    #'+gist/open-current
-        :n [return] #'+gist/open-current
-        :n "b"   #'gist-browse-current-url
+        :n "go"  #'gist-browse-current-url
+        :n "gr"  #'gist-list-reload
         :n "c"   #'gist-add-buffer
         :n "d"   #'gist-kill-current
+        :n "e"   #'gist-edit-current-description
         :n "f"   #'gist-fork
-        :n "q"   #'quit-window
-        :n "r"   #'gist-list-reload
+        :n "q"   #'kill-this-buffer
         :n "s"   #'gist-star
         :n "S"   #'gist-unstar
         :n "y"   #'gist-print-current-url))