Rework Extension to Remove Hard Coded Constants and Add some Features

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No description provided.

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Just testing stuff after I broken my Github authentication

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Changes:

1. After you click "Add Puzzle", a message appears saying that the puzzle has been created and the extension starts polling Cardboard to wait for the sheet to be created. Once the sheet is created, a link to the sheet appears in the extension pop-up.

2. If you open the extension on a puzzle page for a puzzle that has already been created, the extension says that the puzzle already exists and includes a link to the sheet.

3. When you load the hunt page on Cardboard, a message is sent to the extension with the Cardboard URL and hunt id. Then, when you click on the extension, it shows you which hunt you are currently connected to above the "Add Puzzle" button. You can change the hunt you are connected to by going back to Cardboard and opening a new hunt page. There is a tooltip in the extension saying approximately this.

This screen capture shows off the changes and the flow. https://drive.google.com/file/d/1PHDquKq8zhHWUY4dx5JpSwQnu4vDO7pg/view

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Also changed the title limit to 80 to match the backend.

[npinsker]

i didn't test and run this (am trusting the video) but, assuming it doesn't crash, this all looks amazing!! -- thanks :D