Add tutorial to connect to neon

[ananis25]

📚 Context

This PR adds a tutorial in the database section on connecting to Neon databases. I work on technical content for Neon.

🧠 Description of Changes

Added a tutorial document and link to it from the databases page/sidebar.

• content/develop/tutorials/databases/_index.md
• content/develop/tutorials/databases/neon.md
• content/menu.md

💥 Impact

Databases subsection in tutorials

Size:

• [x] Small

🌐 References

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.

[gitguardian[bot]]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

| GitGuardian id | GitGuardian status | Secret | Commit | Filename | | | -------------- | ------------------ | ------------------------------ | ---------------- | --------------- | -------------------- | | [-](https://dashboard.gitguardian.com/workspace/265002/incidents/secrets) | | PostgreSQL Credentials | 26d4fccf82c47caa5a22fc42196e8330c3eb5d3e | content/develop/tutorials/databases/neon.md | [View secret](https://github.com/streamlit/docs/commit/26d4fccf82c47caa5a22fc42196e8330c3eb5d3e#diff-c934232493f794850b4af35564cd6f8812a13424c17e31f43c80b05809fbc16dR46) | | [-](https://dashboard.gitguardian.com/workspace/265002/incidents/secrets) | | PostgreSQL Credentials | fbcacf59ab2b7993e35ab99b16656bd172a46a99 | content/develop/tutorials/databases/neon.md | [View secret](https://github.com/streamlit/docs/commit/fbcacf59ab2b7993e35ab99b16656bd172a46a99#diff-c934232493f794850b4af35564cd6f8812a13424c17e31f43c80b05809fbc16dL46) |

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[raoufchebri]

Hi @chaninn 👋, please let us know if we need to make any changes. 🙏

[sfc-gh-dmatthews]

Hi @ananis25 and @raoufchebri. I'll be taking a look at this. I've planned it for my current sprint and should be able to look at it this week, but since I'm new to neon I'm not 100% sure how much time it will take me to validate the tutorial before I get into it. If there are any issues, I'll comment on the PR, or just make the edits to commit it if they are minor.

[sfc-gh-dmatthews]

I matched the tutorial to a newer tutorial template. I'll give it a final proofread to check that I didn't introduce typos and commit it on Monday. :) Thanks for the contribution!

[ananis25]

Thank you @sfc-gh-dmatthews !