Add release notes for 1.4.2

[philippjfr]

This micro-release fixes a number of smaller regressions and bugs including parsing of notebooks. Many thanks to our new contributor @bkreider, our returning contributors, @jrycw and @ea42gh, and our dedicated team of maintainers including @ahuang11, @MarcSkovMadsen and @philippjfr.

Enhancements

• Allow toggling CTRL+Enter vs Enter to send ChatAreaInput (#6592)
• Allow adding JS callbacks in ChatInterface.button_properties (#6706)

Bug fixes

• Fix regression in parsing notebooks served as apps (#6736)
• Do not include placeholder in ChatInterface.serialize and properly replace placeholder for streams (#6734)
• Remove Perspective.toggle_config which was erroneously reintroduced in 1.4.1 (#6721)
• Fix dynamically setting ChatMessage footer_objects/header_objects (#6705)
• Allow Location.sync of DataFrame parameters (#6745)
• Fix and improve Plotly event handling (#6753)
• Fix issue when converting templated apps to Pyodide/PyScript (#6756)
• Fix styling of loading indicator in Fast design (#6761)
• Ensure VTK nan, above and below colors are serialized (#6763)
• Fix issues with Perspective theme and persist config when switching plugins (#6764)

Documentation

• Various fixes and cleanup of documentation (#6704, #6707, #6710, #6755,)
• Document how display full html document in iframe (#6740)
• Improve Plotly reference documentation (#6751, #6760)

[MarcSkovMadsen]

Should be 1.4.2

[philippjfr]

Thanks! Thought I'd fixed that.