Update for pcp-dstat and Bootstrap 5

[ianw]

Hello,

We use this useful page in our CI jobs. Despite the death of dstat (replaced by pcp dstat wrappers now), nvd3 seeming to be dead and this being on a very old version of D3 it still gets the job done.

The main problem was the focus panel not working with pcp-dstat output

This updates the page to use Bootstrap 5 to fix display issues with the menu. It also updates the non-graphing dependencies and fixes a few small issues.