Start the index and topic index

src/SUMMARY.md

@@ -2,10 +2,10 @@
 
 [Introduction](intro.md)
 
-- [Navigation]()
-  - [By topic]()
+- [Navigation](navigation/intro.md)
+  - [By topic](navigation/topics.md)
   - [FAQs]()
-  - [Index]()
+  - [Index](navigation/index.md)
 
 # Part 1: guide
 

src/navigation/index.md

@@ -0,0 +1,76 @@
+# Index
+
+
+
+- Async/`async`
+  - [blocks](../part-guide/adv-async-await.md#async-blocks)
+  - [closures](../part-guide/adv-async-await.md#async-closures)
+  - [functions](../part-guide/async-await.md#async-functions)
+  - [traits](../part-guide/adv-async-await.md#async-traits)
+  - [c.f., threads](../part-guide/concurrency.md#async-programming)
+- [`await`](../part-guide/async-await.md#await)
+
+
+
+- [Blocking](../part-guide/adv-async-await.md#blocking-and-cancellation)
+  - [IO](../part-guide/adv-async-await.md#blocking-io)
+
+
+
+- [Cancellation](../part-guide/adv-async-await.md#cancellation)
+  - [`CancellationToken`](../part-guide/adv-async-await.md#cancellation)
+- [Concurrency](../part-guide/concurrency.md)
+  - [c.f., parallelism](../part-guide/concurrency.md#concurrency-and-parallelism)
+
+
+
+- [Executor](../part-guide/async-await.md#the-runtime)
+
+
+
+- [Futures](../part-guide/async-await.md#futures-and-tasks)
+  - `Future` trait
+
+
+
+- IO
+  - [Blocking](../part-guide/adv-async-await.md#blocking-io)
+
+
+
+- [Joining tasks](../part-guide/async-await.md#joining-tasks)
+- [`JoinHandle`](../part-guide/async-await.md#joinhandle)
+  - [`abort`](../part-guide/adv-async-await.md#cancellation)
+
+
+
+- Multitasking
+  - [Cooperative](../part-guide/concurrency.md#async-programming)
+  - [Pre-emptive](../part-guide/concurrency.md#processes-and-threads)
+
+
+
+- [Parallelism](../part-guide/concurrency.md#concurrency-and-parallelism)
+  - [c.f., concurrency](../part-guide/concurrency.md#concurrency-and-parallelism)
+
+
+
+- [Reactor](../part-guide/async-await.md#the-runtime)
+- [Runtimes](../part-guide/async-await.md#the-runtime)
+
+
+
+- [Scheduler](../part-guide/async-await.md#the-runtime)
+- [Spawning tasks](../part-guide/async-await.md#spawning-tasks)
+
+
+
+- [Tasks](../part-guide/async-await.md#futures-and-tasks)
+  - [Spawning](../part-guide/async-await.md#spawning-tasks)
+- Testing
+  - [Unit tests](../part-guide/adv-async-await.md#unit-tests)
+- [Threads](../part-guide/concurrency.md#processes-and-threads)
+- [Tokio](../part-guide/async-await.md#the-runtime)
+- Traits
+  - [async](../part-guide/adv-async-await.md#async-traits)
+  - `Future`

src/navigation/intro.md

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+# Navigation
+
+TODO Intro to navigation
+
+- [By topic](topics.md)
+- [FAQs]()
+- [Index](index.md)

src/navigation/topics.md

@@ -0,0 +1,20 @@
+# Topic index
+
+## Concurrency and parallelism
+
+- [Introduction](../part-guide/concurrency.md#concurrency-and-parallelism)
+- [Running async tasks in parallel using `spawn`](../part-guide/async-await.md#spawning-tasks)
+
+## Correctness and safety
+
+- Cancellation
+  - [Introduction](../part-guide/adv-async-await.md#cancellation)
+
+## Performance
+
+- Blocking
+  - [Introduction](../part-guide/adv-async-await.md#blocking-and-cancellation)
+
+## Testing
+
+- [Unit test syntax](../part-guide/adv-async-await.md#unit-tests)