Edit docs to clarify role of static folder (#329)

docs/content/documentation/content/overview.md

@@ -63,3 +63,42 @@ the public web site. You can achieve this by simply setting `ignored_content` in
 ```
 ignored_content = ["*.xlsx"]
 ```
+
+## Static assets
+
+In addition to placing content files in the `content` directory, you may also place content 
+files in the `static` directory.  Any files/folders that you place in the `static` directory
+will be copied, without modification, to the public directory.  
+
+Typically, you might put site-wide assets (such as the site favicon, site logos or site-wide
+JavaScript) in the root of the static directory.  You can also place any HTML or other files that
+you wish to be included without modification (that is, without being parsed as Markdown files)
+into the static directory. 
+
+Note that the static folder provides an _alternative_ to colocation.  For example, imagine that you
+had the following directory structure (a simplified version of the structure presented above):
+
+```bash
+.
+└── content
+    └── blog
+        ├── configuration
+        │    └── index.md // -> https://mywebsite.com/blog/configuration/
+        └── _index.md // -> https://mywebsite.com/blog/
+```
+
+If you wanted to add an image to the `https://mywebsite.com/blog/configuration` page, you would
+have three options:
+ *  You could save the image to the `content/blog/configuration` folder and then link it with a
+ relative path from the `index.md` page.  This is the approach described under **colocation**,
+ above.
+ *  You could save the image to a `static/blog/configuration` folder and link it in exactly the
+ same way as if you had colocated it.  If you do this, the generated files will be identical to 
+ if you had colocated; the only difference will be that all static files will be saved in the 
+ static folder rather than in the content folder.  Depending on your organizational needs, this
+ may be better or worse.
+ *  Or you could save the image to some arbitrary folder within the static folder.  For example,
+ you could save all images to `static/images`.  Using this approach, you would no longer be able
+ to use relative links, but could use an absolute link to `images/[filename]` to access your 
+ image.  This might be preferable for small sites or for sites that associate images with 
+ multiple pages (e.g., logo images that appear on every page).