Richard Powell

### WHY are these changes introduced? We want to improve OAuth by: 1. Making it faster 2. Reducing the amount of screen flicker. ### WHAT is this pull request doing?...

Node template optimizations

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- [ ] Remove unnecessary redirects. See [changes here](https://github.com/Shopify/shopify-app-template-node/commit/16ea0eb33b4cf4a5bed5e023ce0584ee167bf837) - [ ] Replace app bridge redirects with HTTP redirects. See [changes here](https://github.com/Shopify/shopify-app-template-node/commit/5b5d8e9fb4beaa7dffa8c7fd01b5c7f7ccd4fd5b) and [change here](https://github.com/Shopify/shopify-app-template-node/commit/e2304d91b0b65ed7086ad0eae10efc7457c39b02)

Add code to get App URL to shopify-api-node

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Given the Shopify context, and the request, return the URL to the app. See [this code here](https://github.com/Shopify/shopify-app-template-node/compare/cli_three...load-inside-admin?expand=1#diff-1107ca59bb2d9a8cd268c58eb15e6d426d68d37371f73abbb8cc47a6fd75298aR172-R179). This may look something like: ``` const adminPath = Shopify.Utils.getAdminAppURL(req) res.redirect(adminPath) ```

Users like myself, who are new to sail.js, might not know where to find sailsrc, or even that it's a file. This update makes it a little more explicit and...