feat: problem editor

[rayzhou-bit]

This PR makes changes to documentation surrounding the new visual problem editor experience. The sections to change are chapters 8.4 and 10 in Building and Running an edX Course.

General goal of changes:

• Emphasis on the simple editor while keeping advanced editor information tidy and accessible.
• Removal of markdown instructions
• Multiple Choice Problem → Single Select Problem (involves changing ref/links)
• Checkbox Problem → Multi-select Problem (involves changing ref/links)
• Check access points for all Problems, Exercises and Tools and update documentation accordingly

2U internal folder with drafts: https://drive.google.com/drive/folders/1POEM8XiUDttpW7N2no4ea4kovbGSgLAK?usp=share_link

Reviewers

Possible roles follow. The PR submitter checks the boxes after each reviewer finishes and gives :+1:.

• [x] Subject matter expert: Connor Haugh
• [ ] Subject matter expert:
• [ ] Doc team review (sanity check, copy edit, or dev edit?): @edx/doc
• [x] Product review: Jeremy Ristau
• [x] Partner support: Monica Diaz
• [ ] PM review:

Testing

• [ ] Ran ./run_tests.sh without warnings or errors
• [ ] Run ./develop.sh en_us/course_authors/ and check the local HTML output

Post-review

• [ ] Add a comment with the description of this change or link this PR to the next release notes task.
• [ ] Squash commits

[sarina]

Since https://drive.google.com/drive/folders/1POEM8XiUDttpW7N2no4ea4kovbGSgLAK?usp=share_link isn't available to the open source community, could you link to openly available docs or write more in your PR description?

[shellyu]

MIT still uses the deprecated drag and drop documentation. The new drag and drop problem type was launched without some features we leverage in the deprecated version. As a result, we have granted some accessibility exceptions to course teams who still need the features of the deprecated, customresponse version of drag and drop to maintain the quality of their learning materials. These problems are live on edx.org, our residential instance of openedx, and our MITx online instance of openedx.

[rayzhou-bit]

@shellyu Thank you for letting me know! I will put this back in.