Bug fix

[divyabaid16]

Fixes #720 (<=== Add issue number here)

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I have made 2 fixes in this PR:

• Replaced the chat tab with a link to https://publiclab.org/chat
• Removed "Legacy editor" link and code

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[divyabaid16]

@publiclab/mapknitter-reviewers

[jywarren]

This is awesome, @divyabaid16 !!! Thank you so much for responding to these. I had such a busy day yesterday I didn't get to follow up at all. Your help is so appreciated!