* feat: add Note string field to dashboard cells
* wip feat: html escape cell note to help prevent XSS attack
Requires further input to make sure this is effective at its
purpose.
* Add ability to view a cell's note from the cell header
* Make styles less brittle
* Add "chat" icon for use in notes
* Position note using cell X & Y
Avoid overlap with associated cell whenever possible
* New notes are empty strings by default
* Overflow note when contents are large
* Add react-markdown package for displaying markdown
* Display markdown in cell note
* Add a cell note text editor into the CEO
* Improve cell note editor
* Use codemirror placeholder addon
* Add placeholder to note field & foundation of markdown theme
* Add Markdown Cell
* Add initial styles for markdown cell contents
* Add graphic for Note type cell
* feat: add NoteVisibility to DashboardCell
* Add basic markdown syntax highlighting in editor
* Remove comment
* Show note in cell when queries return no data
* Make exception for rule graph
* Update fixtures and resources to fix tests
* Update changelog
* feat: sanitize xss-vulnerable note html
* Polish appearance of code samples in notes and note cells
* Replace ascii with plaintext before passing to markdown renderers
* Move "display when no results toggle" above text field
Less likely to go undiscovered
There were previously no tests around Dashboard serialization to
protobuf, so this patch adds coverage for that. Also, the `go-cmp`
package has been introduced to replace our usage of `reflect.DeepEqual`
going forward because it has better comparison features that make it
more stable across Go versions and produces nice diffs in tests when
they fail, reducing the need for debug lines and manual inspection.