Implement firmware update via web UI

[vyruz1986]

We should be able to update the firmware via the web UI

[simonttp78]

Not the prettiest solution, but definitively the easiest :-):

platformio.ini:

  ayushsharma82/AsyncElegantOTA

WebHandler:

  #include <AsyncElegantOTA.h>

in the "init" function:

  AsyncElegantOTA.begin(_server, "Admin", "FlyballETS.1234");

WebUI --> navbar.component.html:

            <li class="nav-item" [routerLinkActive]="['active']" [routerLinkActiveOptions]= "{exact: true}">  
            <a class="nav-link" href="/update">Firmware update</a> 
            </li>

[vyruz1986]

This is at least better than nothing, I'm fine adopting this if you make a PR for it

[simonttp78]

ok. will do