Tweak doc h1

_sass/markdown.scss

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 .markdown-body {
-  h1 { @include alt-h3; }
+  h1 { @include alt-h2; }
   h2 { @include alt-h3; }
   h3 { @include alt-h3; }
 

docs/github-api.md

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-## Interacting with GitHub
+# Interacting with GitHub
 
 Probot uses [GitHub Apps](https://developer.github.com/apps/). An app is a first-class actor on GitHub, like a user (e.g. [@defunkt](https://github/defunkt)) or an organization (e.g. [@github](https://github.com/github)). The app is given access to a repository or repositories by being "installed" on a user or organization account and can perform actions through the API like [commenting on an issue](https://developer.github.com/v3/issues/comments/#create-a-comment) or [creating a status](https://developer.github.com/v3/repos/statuses/#create-a-status).
 

docs/hello-world.md

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-## Hello World
+# Hello World
 
-A plugin is just a [Node.js module](https://nodejs.org/api/modules.html) that exports a function:
+A Probot plugin is just a [Node.js module](https://nodejs.org/api/modules.html) that exports a function:
 
 ```js
 module.exports = robot => {

docs/http.md

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-
-## HTTP Routes
+# HTTP Routes
 
 Calling `robot.route('/my-plugin')` will return an [express](http://expressjs.com/) router that you can use to expose HTTP endpoints from your plugin.
 

docs/pagination.md

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-### Pagination
+# Pagination
 
 Many GitHub API endpoints are paginated. The `github.paginate` method can be used to get each page of the results.
 

docs/simulating-webhooks.md

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-## Simulating webhooks
+# Simulating webhooks
 
 As you are developing your plugin, you will likely want to test it by repeatedly trigging the same webhook. You can simulate a webhook being delivered by saving the payload to a file, and then calling `probot simulate` from the command line.
 

docs/webhooks.md

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-## Receiving Webhooks
+# Receiving Webhooks
 
 [GitHub webhooks](https://developer.github.com/webhooks/) are fired for almost every significant action that users take on GitHub, whether it's pushes to code, opening or closing issues, opening or merging pull requests, or commenting on a discussion.