Add documentation on how to use Amazon Bedrock

[srdas]

Address Issue #924

Added docs to show how to use Amazon Bedrock models with Jupyter AI. Shows how to use both base models and custom models after fine-tuning, using the model arn (Amazon Resource Name). Results in an extra subsection in the User documentation:

The same section now contains a separate link at the end of the section that directs the user to a subpage with very detailed workflows on setting up and using Amazon Bedrock with Jupyter AI, including how to fine tune a based model to create a custom model and then call the custom model from Jupyter AI. See:

Clicking through on this leads to the following web page:

A "Back" button is also provided to return to the main user documentation page as can be seen on the screenshot above.

[srdas]

@JasonWeill Thanks for your comment ("I'm a bit concerned by how much we're adding that's specific to Amazon Bedrock, including screenshots of the console, instead of deferring to the AWS docs. I'm wondering if we could solicit a review from someone outside AWS, to get an impartial opinion about this").

I have shortened the main user documentation to include only usage in Jupyter AI, and linked it to a subpage where all Bedrock usage details are provided more extensively. Note the new screenshots above.

[JasonWeill]

There are two one-sentence paragraphs near the big table of model providers that say, "To use the Bedrock models, you need access to the Bedrock service. For more information, see the Amazon Bedrock Homepage. … To use Bedrock models, you will need to authenticate via boto3." It might be good to merge these two into one, and to either add a sentence with a link to the Bedrock subpage to the or replace these with a link to the Bedrock subpage.

It might also be good to add a link to "Using Amazon Bedrock with Jupyter AI" to the top of the "Amazon Bedrock Usage" section, either in addition to or instead of the link at the bottom.

The "<--Back" link doesn't look quite right, both because it doesn't use an actual arrow character like ← and because it sends the user back to a place where they may not have been — for example, if they landed on the "Using Amazon Bedrock with Jupyter AI" page from a search engine query. See #655 — this might be better suited for the curiously empty "Section Navigation" in the left pane, to display a hierarchy of documents.

[srdas]

@JasonWeill Thanks so much for the comments. I have addressed them as follows:

Edited the two one-sentence paragraphs down to a single one:

Added an additional link to the top of the "Amazon Bedrock Usage" page just below the first introductory paragraph.

Removed the vacant left panel that was unused. Addresses Issue #655

You are right, the "Back" button is not meaningful and unclear as to where it leads. I replaced it with an explicit link as shown

[JasonWeill]

Thank you! This is a good improvement.