Update callout snippet syntax

https://github.com/moneyadviceservice/mastalk#callout
Merge pull request #76 from moneyadviceservice/fix-4639-callout-snippet

Update callout snippet syntax
Bump cms-editor version to stop tables being converted from Markdown to HTML

https://github.com/moneyadviceservice/cms-editor/commits/master
Merge pull request #77 from moneyadviceservice/bump-cms-editor

Bump cms-editor version
Use modified version of reverse_markdown to convert html to markdown
Add link lookup to auto correct links
Add external link lookup
Video converter with h2 collapsible section
Refactor reverse markdown overrides
Add translation_id to comfy_cms_pages
Update comfortable_mexican_sofa
Add target = "_blank" to external links
Refactor hippo import
Use latest version of hippo_xml_parser
Bump mas-cms-editor version

Fixes tables option setting
Add global navigation menu

As per design. Replaces the dynamic render_main_menu method with
‘static’ HTML due to constraints with the render_main_menu and
active_link_to methods.
Remove irrelevant comment
Add correct locale keys
Add menu link component for all links and sublinks on the main page
Refactor the entire main menu, replacing and add the menu link component