Add documentation about evilifying 'special-mode buffers' (+fix eww)

CHANGELOG.develop

@@ -805,6 +805,8 @@ Other:
     section (thank to Daniel Nicolai)
   - New function =spacemacs/inherit-leader-keys-from-parent-mode= to
     inherit leader key bindings from another mode
+  - Evilify buffer with major-mode derived from =special-mode= by default
+    (thanks to Daniel Nicolai)
 *** Distribution changes
 - Refactored =spacemacs-bootstrap=, =spacemacs-ui=, and =spacemacs-ui-visual=
   layers:

doc/CONVENTIONS.org

@@ -90,6 +90,10 @@ It is recommended to make sure that ~q~ allows to leave the transient-state.
 /Evilifying/ a buffer is to set the =evilified state= as the default
 state for the major mode of the buffer.
 
+Except for =eww-mode= buffers, all buffers with major-modes derived from
+=special-mode= are evilified by default. To exclude buffers of such major-modes
+from getting evilified, add a regexp to =evil-buffer-regexps=.
+
 The =evilified state= is derived from the =emacs state= and modify the
 map to:
 - add ~hjkl~ navigation

doc/DOCUMENTATION.org

@@ -893,6 +893,9 @@ In addition to this, =C-g=, being an important escape key in Emacs, is skipped.
 So anything bound to =g= originally will be found on =C-G=, since =g=, =G= and
 =C-g= are all reserved.
 
+Except for =eww-mode= buffers, all buffers with major modes derived from
+=special-mode= are evilified by default.
+
 ** Evil leader
 Spacemacs uses a leader key to bind almost all its key bindings.
 

layers/+web/eww/packages.el

@@ -31,6 +31,7 @@
   (use-package eww
     :defer t
     :init
+    (add-to-list 'evil-buffer-regexps '("\\*eww\\*" . normal))
     (spacemacs//eww-setup-transient-state)
     (spacemacs/declare-prefix "awe" "eww")
     (spacemacs/set-leader-keys "awee" 'eww)