# What does this PR do?
This PR modifies some of the docs to help them map to (1) the mental
model of software engineers building AI models starting with RAG and
then moving to Agents and (2) aligning the navbar somewhat closer to the
diagram on the home page.
## Test Plan
N/A Tested locally.
# Documentation
Take a look at the screen shot for below and after.
## Before

## After

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Signed-off-by: Francisco Javier Arceo <farceo@redhat.com>
Summary:
- [new] Agent concepts (session, turn)
- [new] how to write custom tools
- [new] non-streaming API and how to get outputs
- [update] remaining `memory` -> `rag` rename
- [new] note importance of `instructions`
Test Plan:
read