WEB: Remove Roadmap points pending a PDEP section from Roadmap
closes https://github.com/pandas-dev/pandas/issues/60913

In https://github.com/pandas-dev/pandas/issues/51471#issuecomment-3075831365 @jbrockmendel wrote

> No evidence the ecosystem wants this, closing.

in https://pandas.pydata.org/about/roadmap.html#roadmap-points-pending-a-pdep

> pandas is in the process of moving roadmap points to PDEPs (implemented in August 2022). During the transition, some roadmap points will exist as PDEPs, while others will exist as sections below.

If we don't have actionable plans than can be written up as a PDEP, let's remove this from the roadmap.

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In https://github.com/pandas-dev/pandas/pull/27478 @TomAugspurger wrote

> Do we want this? Roadmaps tend to go stale. How can we keep this up to date?

So maybe there are other sections that we also want to remove now?

@pandas-dev/pandas-core 
following suggestion by @mroeschke and thumbs up from @jbrockmendel i've removed all Roadmap points pending a PDEP.
 Thanks @simonjayhawkins 