[ADD] rental: new product types page

[meval1006]

Added the 19.3 version of the Product types page for the Configure products subsection of the Rental app.

Changes

• New page in the Configure products section of the Rental app documentation.
• New screen shot and revision of text for v 19.3

Relevant versions

saas-19.3 to master

[robodoo]

[meval1006]

Hi @huisit, this PR is ready for review.

[huisit]

@meval1006 nice addition, it's exciting to watch as you build out this app scope! 💃 I think this is fine to merge as-is, but in future PRs I'd suggest to...

1. Cut redundancies: My main suggestion would be to avoid redundancy between the content in this article and:
   • type.rst : Goods vs. services definitions overlap, consider linking to Goods vs. services section in type.rst instead of defining them here.
     • Combo?: And just to confirm since it's listed as a third type there -- are rentals supported for combo products?
   • rental.rst: Unavailability days config setting is explained in both, consider keeping it one article and linking to it in the other.
2. Consider merging with rental.rst: Depending on how much you do/don't consolidate, consider merging the two.
3. Update landing: Related to article scope, don't forget to update the landing page! I don't see an open PR for rental.rst, so in case you don't have a task for it yet, a future rental.rst PR could:
   • Add new article cards: Add cards for Rental product type and Create a rental order.
   • Un-nest section: Consider making How Minimum Quantity is computed a top-level heading, since there are only four sections.
   • Rename Settings → Configuration: Consider renaming to reflect standard article structure.
   • Make heading names parallel: Give the three price headings parallel names, e.g. Rental pricing/Rental pricelists/Rental minimums.
   • Remove article list: If you add cards for each article, the section lists/TOCs at end of page could be removed.

[meval1006]

Hi @Felicious, this is ready for review.