Admin web page - initial implementation

[Ks89]

• Move pages.menu.ts into the db or into an async service with a delay
• Collapse while resizing (delayed)
• Improve pages with fake data (I'm not interested in real services in this alpha version)
• scrollbar position is wrong (update it with currentTarget.clientWidth in baMenu.component)
• Fix navigation problem because url is /admin.html (it's horrible and has some problems)
• fix webpack chunks order's workaround

PS: not all these tasks must be completed with Alpha 3.

---- deprecated infos--------
Now you can run this application also with npm start.

To be able to try this feature (recommended):
1. run gulp from the main folder
2. cd app_client
3. npm start
4. your browser will navigate to http://localhost:3300
5. Go to http://localhost:3300/admin.html to open the admin application

or (develop config without browsersync)

run gulp from the main folder
cd app_client
npm run buildDev
Go to http://localhost:3001/admin.html to open the admin application
or (production config)

run gulp from the main folder
cd app_client
npm run build
Go to http://localhost:3001/admin.html to open the admin application

[Ks89]

See #17 and #16 for the next alphas