Snippets to fix

[oscarlevin]

Here is a list of snippets that can be improved.

• [x] <p> should be sorted early so that it shows up before vscode-xml's suggestion.
• [x] @label seems to be missing.
• [x] <response/> needs to be added.
• [x] <blockquote> is missing.
• [x] <introduction> and <ul>/<ol> in <objectives>.
• [x] <li> in <ul>/<ol>.
• [x] <xi:include>
• [x] anything inside a <page>

[oscarlevin]

• [x] Add suggestions for file names in xi:include
• [x] exercise in a sidebyside

[oscarlevin]

• [x] statement inside exercise. How is this not working already??
• [x] Remove @xml:id from image
• [x] me isn't working
• [x] parse="text" for inside xi:include
• [x] title in example (at least)
• [x] mrow is the only child of md

[oscarlevin]

• [x] @workspace in task
• [x] title in exercise
• [x] program seems to be missing
• [x] sage

[oscarlevin]

• [ ] line

[oscarlevin]

Missing a lot of the frontmatter elements. Perhaps some also for article-specific tags.