Feature/5 pt showing area companies on a map does not work

Closes issues0#5

What does this MR do?

It deletes the new-stores-button and the drop down menu with "karte" and "liste" from the header of the stores table.

How confident are you it won't break things if deployed?

Quite confident

Checklist

• added a test, or explain why one is not needed/possible... (two buttons vanished. Would not know how to test it)
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))