Remove :lang vala module

To small to warrant a module and vala-mode is unmaintained. It's trivial
for end users to install it themselves.

core/autoload/help.el

@@ -65,8 +65,7 @@
     (sass-mode       :lang web)
     (less-css-mode   :lang web)
     (stylus-mode     :lang web)
-    (terra-mode      :lang terra)
-    (vala-mode       :lang vala))
+    (terra-mode      :lang terra))
   "An alist mapping major modes to Doom modules.
 
 This is used by `doom/help-modules' to auto-select the module corresponding to

init.example.el

@@ -149,7 +149,6 @@
        ;;swift             ; who asked for emoji variables?
        ;;terra             ; Earth and Moon in alignment for performance.
        ;;web               ; the tubes
-       ;;vala              ; GObjective-C
 
        :email
        ;;(mu4e +gmail)       ; WIP

modules/README.org

@@ -150,7 +150,6 @@ Modules that bring support for a language or group of languages to Emacs.
 + swift:
 + terra:
 + web =+lsp=:
-+ vala:
 
 * :email
 + [[file:email/mu4e/README.org][mu4e]] =+gmail=:

modules/lang/vala/packages.el

@@ -1,4 +0,0 @@
-;; -*- no-byte-compile: t; -*-
-;;; lang/vala/packages.el
-
-(package! vala-mode)