Truncated descriptions in widget overview

[jmewes]

Describe the problem

The outline for the widgets in the Widget catalog truncates text which is too long, e.g.

https://docs.flutter.dev/development/ui/widgets/material#Buttons

Expected fix

Either

• include all text in the outline
• shorten the text in the outline
• make the outline expandable, to that one can read the truncated text

Additional context

Source code for example:

https://github.com/flutter/website/blob/15802b7d1d3424f4ab58138f0852b6d243c6813b/src/_data/catalog/widgets.json#L838