Eliminate requirement to add blank line to get markdown formatting

[hughess]

Description

Currently, when using components or each/if blocks, a blank line is required to get markdown formatting.

This PR removes the need for a blank line by injecting it for you behind the scenes.

This PR needs solid testing before merging

Example

<Alert>
This is a **default** alert
</Alert>

Before

After

Testing Needed

• Are all edge cases covered? Currently covers:
  • HTML tags excluded
  • Components inside strings excluded
  • Components inside code blocks
• Does this affect page load significantly?
• Each and if block testing
• Nested components and each/if blocks testing
• Ideally we should have a workaround to give people if there are edge cases we miss and it breaks the content on the page

Checklist

• For UI or styling changes, I have added a screenshot or gif showing before & after
• I have added a changeset

[archiewood]

Related:

• Lists

#479

[hughess]

now includes a fix for lists