Updated titles into a consistent format.
Fixed links to the diagrams.
Fixed typos.
Note: The Templates menu in the navbar is now sorted by the file names.
I'll try sorting the navbar menus by the page titles, not the page file
names.
This change adds a new template for simple RAG using the SingleStoreDB
vectorstore.
Twitter: @alexjpeng
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Co-authored-by: Erick Friis <erick@langchain.dev>
