Add ui/hydra module

And conforms all existing hydras to the naming convention for
interactive commands, e.g.

  +vc-gutter-hydra -> +vc/gutter-hydra

modules/ui/hydra/autoload/windows.el

@@ -0,0 +1,47 @@
+;;; ui/hydra/autoload/windows.el -*- lexical-binding: t; -*-
+
+;;;###autoload (autoload '+hydra/text-zoom/body "ui/hydra/autoload/windows" nil t)
+(defhydra +hydra/text-zoom (:hint t :color red)
+  "
+      Text zoom: _j_:zoom in, _k_:zoom out, _0_:reset
+"
+  ("j" doom/increase-font-size "in")
+  ("k" doom/decrease-font-size "out")
+  ("0" doom/reset-font-size "reset"))
+
+;;;###autoload (autoload '+hydra/window-nav/body "ui/hydra/autoload/windows" nil t)
+(defhydra +hydra/window-nav (:hint nil)
+  "
+          Split: _v_ert  _s_:horz
+         Delete: _c_lose  _o_nly
+  Switch Window: _h_:left  _j_:down  _k_:up  _l_:right
+        Buffers: _p_revious  _n_ext  _b_:select  _f_ind-file
+         Resize: _H_:splitter left  _J_:splitter down  _K_:splitter up  _L_:splitter right
+           Move: _a_:up  _z_:down  _i_menu
+"
+  ("z" scroll-up-line)
+  ("a" scroll-down-line)
+  ("i" idomenu)
+
+  ("h" windmove-left)
+  ("j" windmove-down)
+  ("k" windmove-up)
+  ("l" windmove-right)
+
+  ("p" previous-buffer)
+  ("n" next-buffer)
+  ("b" switch-to-buffer)
+  ("f" find-file)
+
+  ("s" split-window-below)
+  ("v" split-window-right)
+
+  ("c" delete-window)
+  ("o" delete-other-windows)
+
+  ("H" hydra-move-splitter-left)
+  ("J" hydra-move-splitter-down)
+  ("K" hydra-move-splitter-up)
+  ("L" hydra-move-splitter-right)
+
+  ("q" nil))