docs - "roadmap as of 3/2019" is out of date

[j-carson]

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ALL software version info

website accessed 12/28/2022: https://holoviews.org/roadmap.html shows the state of the project and future plans as of 3/2019

Description of expected behavior and the observed behavior

Would like more current information about the state of this project

Complete, minimal, self-contained example code that reproduces the issue

Not applicable