Site-standardize intro page formatting

Serves https://github.com/bazelbuild/bazel/issues/10794

Closes #10828.

PiperOrigin-RevId: 296263464
diff --git a/site/docs/bazel-overview.md b/site/docs/bazel-overview.md
index 3b062ae..6cca1fa 100644
--- a/site/docs/bazel-overview.md
+++ b/site/docs/bazel-overview.md
@@ -1,9 +1,11 @@
 ---
 layout: documentation
-title: Bazel Overview
+title: Bazel overview
 ---
 
-# What is Bazel?
+# Bazel overview
+
+## What is Bazel?
 
 Bazel is an open-source build and test tool similar to Make, Maven, and Gradle.
 It uses a human-readable, high-level build language. Bazel supports projects in
@@ -11,7 +13,7 @@
 large codebases across multiple repositories, and large numbers of users.
 
 
-# Why should I use Bazel?
+## Why should I use Bazel?
 
 Bazel offers the following advantages:
 
@@ -41,7 +43,7 @@
     framework.
 
 
-# How do I use Bazel?
+## How do I use Bazel?
 
 To build or test a project with Bazel, you typically do the following:
 
@@ -75,7 +77,7 @@
 to trace dependencies in your code.
 
 
-# How does Bazel work?
+## How does Bazel work?
 
 When running a build or a test, Bazel does the following:
 
@@ -96,7 +98,7 @@
 and maximizing [reproducibility](guide.html#correctness).
 
 
-## What is the action graph?
+### What is the action graph?
 
 The action graph represents the build artifacts, the relationships between them,
 and the build actions that Bazel will perform. Thanks to this graph, Bazel can
@@ -106,7 +108,7 @@
 easily [trace dependencies](query-how-to.html) in your code.
 
 
-# How do I get started?
+## How do I get started?
 
 To get started with Bazel, see [Getting Started](getting-started.html) or jump
 directly to the Bazel tutorials: