Fix link to PWA section of docs

[angie]

Fix link to PWA docs until #5536 is addressed.

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[iansu]

I appreciate your trying to fix this. However, this doesn't really solve the problem since these links are in the template. This would help for new apps but there are millions of existing apps out there that will still have the old bit.ly links in them. To address that I've created this PR: #5808

[angie]

I hadn't thought of existing apps @iansu 😅. I'll close this.

[iansu]

Yeah, it's a bit of a weird situation with those files being copied into people's apps. Thanks for your contribution though!