📚 Add documentation about Tableau Server

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Tableau documents how to set up/allow Web Data Connectors in Tableau Server generally at https://help.tableau.com/current/server/en-us/datasource_wdc.htm .

The following shell commands have been used to allow-list the Airtable Tableau WDC in this repository

# allow extract refreshes for WDCs
tsm data-access web-data-connectors allow -r true 

# allow Airtable Labs WDC 
tsm data-access web-data-connectors add --name "Airtable Labs WDC" --url https://airtable-labs.github.io:443/airtable-tableau-wdc --secondary https://airtable-labs.github.io/airtable-tableau-wdc/.*,https://airtable.com/css/compiled/all.css,https://cdn.jsdelivr.net/npm/*,https://connectors.tableau.com/*

# apply changes
tsm pending-changes apply

# confirm allow list
tsm data-access web-data-connectors list

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Additionally, if your Tableau Server and the underlying network requires an explicit allow list, api.airtable.com should be added to your network configuration.