[fix] brands: add variables from build env to grunt process

We have some variables in the build environment which are also needed in the
grunt process when building themes.  Theses variables are relavant if one
creates a fork with its own branding.  We treat these variables under the term
'brands'.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

manage.sh

@@ -156,15 +156,6 @@ styles() {
     build_style less/bootstrap/bootstrap.less css/bootstrap.min.css
 }
 
-grunt_build() {
-    npm_path_setup
-
-    echo '[!] Grunt build : oscar theme'
-    grunt --gruntfile "$SEARX_DIR/static/themes/oscar/gruntfile.js"
-    echo '[!] Grunt build : simple theme'
-    grunt --gruntfile "$SEARX_DIR/static/themes/simple/gruntfile.js"
-}
-
 docker_build() {
     # Check if it is a git repository
     if [ ! -d .git ]; then
@@ -257,7 +248,6 @@ Commands
     -----
     locales              - Compile locales
     styles               - Build less files
-    grunt_build          - Build files for themes
     docker_build         - Build Docker image
 
     Tests