docs: scaffolded out FDT

Author: arctic-hen7

docs/next/en-US/features.md

@@ -6,3 +6,141 @@ The rest of these docs are written in a bit of an experimental way. Perseus is *
 
 If you've got a usage pattern that isn't in here, [let us know](https://github.com/arctic-hen7/perseus/issues/new), and we'll happily add it!
 
+<details>
+<summary>Hooking into the router to know when page transitions are occurring</summary>
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+
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+</details>
+<details>
+<summary>Custom index view</summary>
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+</details>
+<details>
+<summary>Debugging</summary>
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+
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+</details>
+<details>
+<summary>Modifying the <code>head</code></summary>
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+
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+</details>
+<details>
+<summary>Modifying HTTP headers</summary>
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+
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+</details>
+<details>
+<summary>Adding static content</summary>
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+
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+</details>
+<details>
+<summary>Using internationalization</summary>
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+
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+</details>
+<details>
+<summary>Custom translations manager</summary>
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+
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+</details>
+<details>
+<summary>Global state</summary>
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+
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+</details>
+<details>
+<summary>State freezing/thawing</summary>
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+</details>
+<details>
+<summary>Freezing to browser storage (IndexedDB)</summary>
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+
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+</details>
+<details>
+<summary>Writing tests</summary>
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+
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+</details>
+<details>
+<summary>Styling</summary>
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+
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+</details>
+<details>
+<summary>Communicating with a server</summary>
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+</details>
+<details>
+<summary>Custom server with API routes</summary>
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+</details>
+<details>
+<summary>Plugins</summary>
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+
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+</details>
+<details>
+<summary>Deploying to Docker</summary>
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+</details>
+<details>
+<summary>Deploying to a relative path</summary>
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+</details>
+<details>
+<summary>Route announcer</summary>
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+</details>
+<details>
+<summary>Authentication</summary>
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+</details>
+<details>
+<summary>Unreactive state</summary>
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+</details>
+<details>
+<summary>Imperative router control</summary>
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+</details>
+<details>
+<summary>JS interop</summary>
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+
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+</details>