Add support for initial_screen

Author: JoaoOliveiraRocha

docs/initial-screen.md

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+sidebar_position: 12
+---
+
+# Initial Screen
+
+The initial screen on Topper is the amount and asset selection.
+
+To skip this screen on initialization and go straight to authentication, simply add the `initial_screen` query parameter to the URL like `https://app.topperpay.com/?bt=<bootstrap token>&initial_screen=authentication`.
+
+
+
+| Amount selection screen | Authentication screen   |
+|-------------------------|-------------------------|
+| <img src="/images/amount-selection-screen.jpg" alt="Amount selection screen" width="300"/> | <img src="/images/get-started-screen.jpg" alt="Authentication screen" width="300"/> |
+
+
+**What other initial screens are supported?**
+
+Currently only the Authentication screen is supported.
+
+
+**Using the [Web SDK](./web-sdk.md):**
+
+```js
+const topper = new TopperWebSdk({ initial_screen: TOPPER_INITIAL_SCREENS.AUTHENTICATION });
+
+topper.initialize({ bootstrapToken: <bootstrap token> });
+```

docs/mobile.md

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-sidebar_position: 13
+sidebar_position: 14
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 # Mobile

docs/web-sdk.md

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-sidebar_position: 12
+sidebar_position: 13
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 # Web SDK