chore: update .gitignore and package-lock.json; modify copy-plugins script

- Added 'public/assets/global/plugins' and 'plugins-to-copy/' to .gitignore.
- Removed 'ngl' dependency from package-lock.json.
- Adjusted copy-plugins script to change the destination path for bootstrap fonts.

Author: obazopaz

front_end/openVRE/.gitignore

@@ -1,3 +1,4 @@
 # Node modules
 node_modules/
-public/assets/global/plugins
+public/assets/global/plugins
+plugins-to-copy/

front_end/openVRE/package-lock.json

@@ -113,7 +113,7 @@ const COPY_DIRS = [
     'bootstrap.css.map',
     'bootstrap.min.css.map',
   ]],
-  ['bootstrap/dist/fonts', 'bootstrap/fonts/bootstrap'],
+  ['bootstrap/dist/fonts', 'bootstrap/fonts'],
   ['flot', 'flot', [
     'examples',
     '.travis.yml',