update grunt-node-sass & no longer use old version of node (#77)

* update grunt-node-sass

* use node 14 in pipeline

* also use newer grunt-node-sass for client

* don't specify node version

* update lock files & clean up using old node

.github/workflows/pipeline.yml

@@ -15,10 +15,8 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Use Node 10.x for compatibility with node-sass
+      - name: setup node
         uses: actions/setup-node@v2
-        with:
-          node-version: 10.x
       - name: cache .npm folder
         uses: actions/cache@v2
         env:

README.md

@@ -43,8 +43,6 @@ SETUP DEVELOPER ENVIRONMENT
 ---------------------------
 
 **1. Install [NodeJS](http://nodejs.org/) and open Terminal / CMD**
-!! grunt-node-sass is not compatible with newer versions of nodejs. So make sure that `node -v` is <= 10.x.x !! 
-(maybe consider using nvm (node version manager) `nvm use v10.24.1`)
 
 **2. Install Yeoman, Bower and Yeoman generator**
 ```