Need to update how to get Google Sheets url

[epetenko]

Hey Carla,
Rudy asked me for guidance on creating a NJAM-datatables and it reminded me that the way to right the right url has changed. The tabletop.js Github page has the right way to do it:

1) Publishing your Google Sheet

The first step is to get your data out into a form Tabletop can digest

Make a Google Spreadsheet. Give it some column headers, give it some content.

Name            Category   Healthiness
Carrot          Vegetable  Adequate
Pork Shoulder   Meat       Questionable
Bubblegum       Candy      Super High

Now go up to the File menu and pick Publish to the web. Fiddle with the options, then click Start publishing. A URL will appear, something like https://docs.google.com/spreadsheets/d/e/2PACX-1vQ2qq5UByYNkhsujdrWlDXtpSUhh7ovl0Ak6pyY3sWZqEaWS2lJ0iuqcag8iDLsoTuZ4XTiaEBtbbi0/pubhtml .

IGNORE THIS URL! You used to be able to use it, you can't anymore (you still need to do this step, though).

Now that you've published your sheet, you now need to share it, too.

1. Click the Share link in the upper right-hand corner
2. Click the very pale Advanced button
3. Change... access to "On - Anyone with a link"
4. Make sure Access: Anyone says Can view, since you don't want strangers editing your data
5. Click Save

Copy the Link to Share. Your URL should look something like https://docs.google.com/spreadsheets/d/1Io6W5XitNvifEXER9ECTsbHhAjXsQLq6VEz7kSPDPiQ/edit?usp=sharing. It should not have a /d/e in it.

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Anyway, I'm not super sure how to submit a pull request but I can do this if that's ok with you.