adding ATLAS sections

I added the general structure for the ATLAS section, I haven't put much content in there yet. I am a bit uncertain about the websearch.py. Can I get some feedback whether I implemented everything correctly?

Best regards,

Felix
Hi, the whole code in the file reads as:
```
<a href="{{ url_for('VM/CMS') }}"><img class="exp-xs-img" src="{{url_for('static', filename='img/CMS.gif')}}" alt=""></a>
<a href="{{ url_for('VM/ALICE') }}"><img src="{{url_for('static', filename='img/ALICE.gif')}}" class="exp-xs-img" alt=""></a>
<a href="{{ url_for('VM/ATLAS') }}"><img src="{{url_for('static', filename='img/ATLAS.gif')}}" class="exp-xs-img" alt=""></a></li>
```

I don't see a duplicated line, ALICE and ATLAS are different.