Work items for next release

[cpsievert]

• Finish automated tests bslib::accordion() tests shinycoreci#152 and bslib::sidebar() tests shinycoreci#153
• Blog post
• Add fillable = fill argument to shiny::uiOutput(). Deprecate "container"/"item" value.
• Mark things like navbarPage(), fillPage(), etc. as being superceded?
• Revist bindFillRole() vocab/interface

[github-actions]

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