docs: more detailed bricks writeup; reoganize docs (#304)

* add print statement in readme

* elements before bricks

* new preamble to bricks section

* add preamble to bricks section

* add preamble to cleaning section

* descriptions of each documentation page

* non-brick helper functions to the bottom

* fix codeblock

* includes some optional kwargs

* code blocks

* typo fix

Author: MthwRobinson

README.md

@@ -32,7 +32,7 @@
 </h2>
 <div align="center">
   <p>Unstructured wants to make it easier to connect to your data…and we need your help! We’re excited to announce a <a href="Competition.md">competition</a> focused on improving Unstructured's ability to seamlessly process data from the sources you care about most.</p>
-	
+
   <p>The competition starts now and continues through March 10...and most importantly, we're offering cash prizes! Please join our <a
   href="https://join.slack.com/t/unstructuredw-kbe4326/shared_invite/zt-1nlh1ot5d-dfY7zCRlhFboZrIWLA4Qgw">
    community Slack</a> to participate and follow along</p>
@@ -85,6 +85,7 @@ At this point, you should be able to run the following code:
 from unstructured.partition.auto import partition
 
 elements = partition(filename="example-docs/fake-email.eml")
+print("\n\n".join([str(el) for el in elements]))
 ```
 
 And if you installed with `local-inference`, you should be able to run this as well:
@@ -93,6 +94,7 @@ And if you installed with `local-inference`, you should be able to run this as w
 from unstructured.partition.auto import partition
 
 elements = partition("example-docs/layout-parser-paper.pdf")
+print("\n\n".join([str(el) for el in elements]))
 ```