Spacemacs config refinements

- Delete excess themes
- Move some code into its own function to be more idiomatic

spacemacs

@@ -42,7 +42,6 @@
           ;; Aesthetics
           (colors :variables
                   colors-colorize-identifiers 'all)
-          themes-megapack
           ))
 
   ;; Enable osx layer only on Macs
@@ -89,15 +88,14 @@ before layers configuration."
    ;; directory. A string value must be a path to an image format supported
    ;; by your Emacs build.
    ;; If the value is nil then no banner is displayed.
-   dotspacemacs-startup-banner 'official
+   dotspacemacs-startup-banner nil
    ;; List of items to show in the startup buffer. If nil it is disabled.
    ;; Possible values are: `recents' `bookmarks' `projects'."
    dotspacemacs-startup-lists '(recents projects)
    ;; List of themes, the first of the list is loaded when spacemacs starts.
    ;; Press <SPC> T n to cycle to the next theme in the list (works great
    ;; with 2 themes variants, one dark and one light)
-   dotspacemacs-themes '(spacemacs-dark
-                         material)
+   dotspacemacs-themes '(spacemacs-dark)
    ;; If non nil the cursor color matches the state color.
    dotspacemacs-colorize-cursor-according-to-state t
    ;; Default font. `powerline-scale' allows to quickly tweak the mode-line
@@ -181,12 +179,12 @@ before layers configuration."
    ruby-version-manager 'rbenv
    ruby-enable-ruby-on-rails-support t
    ;; Auto-resume layouts on relaunch
-   dotspacemacs-auto-resume-layouts nil
-   )
+   dotspacemacs-auto-resume-layouts nil))
+
+(defun dotspacemacs/user-init ()
   ;; User initialization goes here
   (add-to-list 'default-frame-alist '(height . 60))
-  (add-to-list 'default-frame-alist '(width . 115))
-  )
+  (add-to-list 'default-frame-alist '(width . 115)))
 
 (defun dotspacemacs/user-config ()
   "Configuration function.