Edit docs to say that sections require an _index.md file (#341)
				
					
				
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				| @ -6,6 +6,22 @@ weight = 30 | ||||
| A page is any file ending with `.md` in the `content` directory, except files | ||||
| named `_index.md`. | ||||
| 
 | ||||
| If a file ending with `.md` is named `index.md`, then it will generate a page | ||||
| with the name of the containing folder (for example, `/content/about/index.md` would | ||||
| create a page at `[base_url]/about`).  (Note the lack of an underscore; if the file | ||||
| were named `_index.md`, then it would create a **section** ad `[base_url]/about`, as | ||||
| discussed in the prior part of this documentation.  But naming the file `index.md` will | ||||
| create a **page** at `[base_url]/about`). | ||||
| 
 | ||||
| If the file is given any name *other* than `index.md` or `_index.md`, then it will | ||||
| create a page with that name (without the `.md`). So naming a file in the root of your | ||||
| content directory `about.md` would also create a page at `[base_url]/about`. | ||||
| 
 | ||||
| As you can see, creating an `about.md` file is exactly equivalent to creating an  | ||||
| `about/index.md` file.  The only difference between the two methods is that creating | ||||
| the `about` folder allows you to use asset colocation, as discussed in the  | ||||
| [Overview](./documentation/content/overview.md) section of this documentation. | ||||
| 
 | ||||
| ## Front-matter | ||||
| 
 | ||||
| The front-matter is a set of metadata embedded in a file. In Gutenberg, | ||||
|  | ||||
| @ -3,19 +3,28 @@ title = "Section" | ||||
| weight = 20 | ||||
| +++ | ||||
| 
 | ||||
| A section is automatically created when a folder is found in the `content` section, unless it only | ||||
| contains a `index.md` file and is actually a page with assets. | ||||
| A section is created whenever a folder (or subfolder) in the `content` section contains an  | ||||
| `_index.md` file.  If a folder does not contain an `_index.md` file, no section will be  | ||||
| created, but markdown files within that folder will still create pages (known as orphan pages). | ||||
| 
 | ||||
| You can add `_index.md` file to a folder to augment a section and give it some metadata and/or content. | ||||
| 
 | ||||
| The index page is actually a section created automatically like any other: you can add metadata | ||||
| and content by adding `_index.md` at the root of the `content` folder. | ||||
| The index page (i.e., the page displayed when a user browses to your `base_url`) is a section,  | ||||
| which is created whether or not you add an `_index.md` file at the root of your `content` folder. | ||||
| If you do not create an `_index.md` file in your content directory, this main content section will | ||||
| not have any content or metadata.  If you would like to add content or metadata, you can add an | ||||
| `_index.md` file at the root of the `content` folder and edit it just as you would edit any other | ||||
| `_index.md` file; your `index.html` template will then have access to that content and metadata. | ||||
| 
 | ||||
| ## Front-matter | ||||
| 
 | ||||
| The `_index.md` file within a folder defines the content and metadata for that section.  To set | ||||
| the metadata, add front matter to the file. | ||||
| 
 | ||||
| The front-matter is a set of metadata embedded in a file. In Gutenberg, | ||||
| it is at the beginning of the file, surrounded by `+++` and uses TOML. | ||||
| 
 | ||||
| After the closing `+++`, you can add content that will be parsed as markdown and will be available | ||||
| to your templates through the `section.content` variable. | ||||
| 
 | ||||
| While none of the front-matter variables are mandatory, the opening and closing `+++` are required. | ||||
| 
 | ||||
| Here is an example `_index.md` with all the variables available: | ||||
|  | ||||
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