Remove the signals section for now

src/SUMMARY.md

@@ -47,7 +47,6 @@
 	* [Acquire and Release](./atomics/acquire-release.md)
 	* [SeqCst](./atomics/seqcst.md)
 	* [Fences](./atomics/fences.md)
-	* [Signals](./atomics/signals.md)
 * [Implementing Vec](./vec/vec.md)
   * [Layout](./vec/vec-layout.md)
   * [Allocating](./vec/vec-alloc.md)

src/atomics/signals.md

@@ -1,3 +0,0 @@
-# Signals
-
-(and compiler fences)