doc: add sphinx-panels to the documentation

This plugin replaces sphinx-tabs, so that's removed.
The panels plugin will add bootstrap responsive cards to the docs
allowing us to use them instead of the ad-hoc table we had.

Additionally, this changes the example gallery tool too,
since the main gallery was built using our own table implementation.

Since Panels also provides options to add content in tabs, with CSS
instead of JS (from sphinx-tabs), we update the generated examples
files.

Fixing warning messages related to files that didn't exist,
duplicated references, and redundant indexes.

Task-number: PYSIDE-1112
Pick-to: 6.0
Change-Id: Id19be92e72f0a18f63b76daf1898080f3e199626
Reviewed-by: Christian Tismer <[email protected]>
Reviewed-by: Friedemann Kleint <[email protected]>

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