Embed conceptual videos (#761)

Author: Paul-Cornell

ui/chunking.mdx

@@ -2,6 +2,16 @@
 title: Chunking
 ---
 
+<iframe
+  width="560"
+  height="315"
+  src="https://www.youtube.com/embed/ZWpm_TzwN-w"
+  title="YouTube video player"
+  frameborder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+  allowfullscreen
+></iframe>
+
 After partitioning, _chunking_ rearranges the resulting document elements into manageable "chunks" to stay within 
 the limits of an embedding model and to improve retrieval precision. The goal is to retrieve only parts of documents 
 that contain only the information that is relevant to a user's query. You can specify if and how Unstructured chunks 

ui/document-elements.mdx

@@ -2,6 +2,16 @@
 title: Document elements and metadata
 ---
 
+<iframe
+  width="560"
+  height="315"
+  src="https://www.youtube.com/embed/qWu9HPRkkPg"
+  title="YouTube video player"
+  frameborder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+  allowfullscreen
+></iframe>
+
 When Unstructured [partitions](/ui/partitioning) a file, the result is a list of _document elements_, sometimes referred to simply as _elements_. These elements represent different components of the source file. 
 
 ## Element example

ui/partitioning.mdx

@@ -2,6 +2,16 @@
 title: Partitioning
 ---
 
+<iframe
+  width="560"
+  height="315"
+  src="https://www.youtube.com/embed/0HAWt9Xog-Y"
+  title="YouTube video player"
+  frameborder="0"
+  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+  allowfullscreen
+></iframe>
+
 _Partitioning_ extracts content from raw unstructured files and outputs that content as structured [document elements](/ui/document-elements).
 
 For specific file types, such as image files and PDF files, Unstructured offers special strategies to partition them. Each of these