docs/library/index: Remove all conditionals from library index.

It's fair to just provide a link to all available modules, regardless of
the port.  Most of the existing ports (unix, stm32, esp8266, esp32) share
most of the same set of modules anyway, so no need to maintain separate
lists for them.  And there's a big discussion at the start of this index
about modules not being available on a given port.

For port-specific modules, they can also be listed unconditionally because
they have headings that explicitly state they are only available on certain
ports.

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