Add RepoWise announcement blog post

[sankalp112kashyap]

This PR adds a new blog post titled "Introducing RepoWise: A Conversational AI Tool for OSS Repositories" under content/posts/repowise-announcement/index.md.
The post highlights:

• RepoWise's motivation and mission
• Technical architecture (intent router, RAG pipeline, CSV data pipeline, prompt assembly, LLM generation)
• Use cases for contributor onboarding, governance assessment, and repository exploration
• Future directions including agentic multi-turn reasoning

Images are externally hosted via GitHub raw URLs, so no static assets are included.

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[sankalp112kashyap]

Hi @LauraLangdon,
I am Sankalp, a Grad Student Researcher at DECAL Lab, UC Davis.
Can you please review this PR when possible?

Thanks.

[LauraLangdon]

I've requested a change below, to help give context to readers about who "we" is. 😊

[sankalp112kashyap]

Thanks for reviewing it. Incorporated suggested change. :)