Adding IAC assets to recreate static web apps for Docs and Blogs site

[paulyuk]

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Description

Adding /iac folder with bicep templates/scripts needed to recreate and configure a static web app suitable for hosting a docs site or blog site. Any sensitive or unique variables should be set as environment variables using the Readme and /iac/swa/infra/main.parameters.bicep as a reference.

[paulyuk]

As an end to end test I updated the publish token for the 1_7 version of the docset CI/CD to deploy to the new tenant (since it's low risk to anyone) and it's all working well from what I can see:

v1.7 docs on new dapr.io tenant:
https://kind-forest-0528f841e.5.azurestaticapps.net/

dapr blog on new dapr.io tenant:
https://delightful-pebble-097ed421e.5.azurestaticapps.net/

[marcduiker]

@holopin-bot @paulyuk Enjoy your Dapr docs badge!

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