Python datetime and days_in_month

[anissa111]

PR Summary

• Adds general "Working with Date and Time" python-first entry in applications/date_time/datetime.ipynb
  • adds section on calculating days in month on python-first page
• Moves ncl-based content to ncl/ncl_entries
• Adds days_in_month in ncl/ncl_entries/days_in_month.ipynb
• Adds a days_in_month receipt to ncl/receipts/days_in_month.ipynb
• Updates the NCL Index to include days_in_month

Related Tickets & Documents

Part of #15 Closes #45

PR Checklist

General

• [x] PR includes a summary of changes
• [x] Link relevant issues, make one if none exist

Spawned issues

• 48

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Meowdy! See your PR preview: 🔍 Git commit SHA: 144ddd7a5197c656f0b0baddf49064c67109d0a9 ✅ Deployment Preview URL: https://NCAR.github.io/geocat-applications/_preview/44

[cyschneck]

Looks great! More of a general question, should the Date and Time header be a link?

[anissa111]

Looks great! More of a general question, should the Date and Time header be a link?

Good question! That comes from a design decision we made way early on, where each "card" would have a landing page with more detailed previews of all the notebooks in the folder. Right now, though, that "landing page" just has a toc on it.

I think the original decision might make more sense once we have more content and once we decide what those "landing pages" should look like, but should we skip having them for now until they make more sense? @jukent @kafitzgerald

[jukent]

Yes I believe the idea is to have gallery cards for each individual example under each category. I have no problem with removing it for now though.