Add Integraion News

[leo-gan]

Checked

• I searched existing ideas and did not find a similar one
• I added a very descriptive title
• I've clearly described the feature request and motivation for it

Feature request

Add news about new LangChain integrations.

Motivation

To add more dynamics to the documentation and more incentives to read it.

Proposal (If applicable)

It could be implemented in several ways:

• add the News section on top of the Integration index page
• add the separate News section page and link to it (TBD on top of the Integration index page)

Maybe also add the feed functionality.