Add a TOC

Author: steveklabnik

src/doc/rustc/src/SUMMARY.md

@@ -1,3 +1,13 @@
-# Summary
+# The Rustc Book
 
-- [Chapter 1](./chapter_1.md)
+- [What is rustc?](what-is-rustc.md)
+- [Command-line arguments](command-line-arguments/index.md)
+- [Lints](lints/index.md)
+    - [Lint levels](lints/levels.md)
+    - [Lint Groups](lints/groups.md)
+    - [Lint listing](lints/listing/index.md)
+        - [Allowed-by-default lints](lints/listing/allowed-by-default.md)
+        - [Warn-by-default lints](lints/listing/warn-by-default.md)
+        - [Deny-by-default lints](lints/listing/deny-by-default.md)
+- [Codegen options](codegen-options/index.md)
+- [Contributing to `rustc`](contributing.md)

src/doc/rustc/src/chapter_1.md

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+# Codegen options

src/doc/rustc/src/codegen-options/index.md

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+# Command-line arguments

src/doc/rustc/src/command-line-arguments/index.md

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+# Contributing to rustc

src/doc/rustc/src/contributing.md

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+# Lint Groups

src/doc/rustc/src/lints/groups.md

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+# Lints

src/doc/rustc/src/lints/index.md

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+# Lint levels

src/doc/rustc/src/lints/levels.md

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+# Allowed-by-default lints

src/doc/rustc/src/lints/listing/allowed-by-default.md

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+# Deny-by-default lints