README.md: Update documentation link

[nils]

Issue #, if available: n/a

Description of changes: Update documentation link

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[daveconnie2]

We are doing smart TV development work here at BannonDigital. Part of our design is offering a capability to present video content to Fire TV, Apple TV, and Roku. The Fire TV work is being coded using your Builder kit. This work has not been a full time effort. Lately we are shifting our focus to this part of our development plan. We have had success in producing 2 Fire TV apps early in May. Since then any upgrade or dependency changes has produced many sync and build failures. We have lost any baseline stability. Here is a summary of our support correspondence. 4/16 CASE 6942016151 [amzn/fire-app-builder] Cannot run sample Application with Android Studio 3.6.3 (#60) 5/28 [amzn/fire-app-builder] Gradle Sync Failed (#62) 6/2 RE:[CASE 7017615991] Bannon Digital[QUESTION_APP_SUBMISSION][M18X3OJ06MPSE7] 6/29 Re: [amzn/fire-app-builder] Unable to update project to latest android studio : Gradle DSL method not found: 'deleteAllActions() (#54) We need help. Questions:

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