feat!: render roadmaps with d3

[SgtPooki]

Follow https://github.com/pln-planning-tools/Starmap/issues/237 for updates, and please feel free to comment on that issue with concerns/questions/requests.

• chore: fix error when clicking roadmap item in d3 mode
• chore: render d3 roadmap with correct header
• chore: pull out date logic
• feat: get d3 mode rendering
• chore: ensure today line toggles properly
• chore: roadmap header ticks&labels are rendering
• tmp
• tmp: attempting panning impl and quit. started on collision detection
• chore: expand mode=d3 milestone items width to match text
• chore(d3): start work on collision detection
• feat: bin-packing algorithm implemented for d3 rendering
• feat: bin-packing is working really well
• feat: d3 panning works
• feat: d3 zooming + panning
• fix: d3 roadmap view width
• fix: milestone text
• fix(milestone): d3 rendering is more accurate
• fix(milestone): d3 milestones show progress bar
• fix(milestone): text padding, size, polish, truncating
• fix(drag): prevent unintentional attempt to drag milestone items
• fix: d3 roadmap height + panning and zoom polish
• fix: date granularity upon zooming out
• feat: SERIOUS polish on zoom, pan, & header labels
• tmp: temporarily force rendering of d3 roadmap for preview
• chore: fix build errors

fixes https://github.com/pln-planning-tools/Starmap/issues/237

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Name	Status	Preview	Comments	Updated (UTC)
starmaps	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 8:44pm

[SgtPooki]

I don't want to delay the merging of this too long, but I also don't want to break existing users, so I'm also going to add a "legacy view" that will allow users to revert back to the old functionality if they need to. This should force existing users to provide feedback, while allowing them an easy backdoor to their familiar experience.

Going with legacy.starmap.site approach mentioned below: https://github.com/pln-planning-tools/Starmap/pull/358#issuecomment-1536697119

[BigLep]

@SgtPooki : the plan sounds good if you're worried about disruption with this change. Another thought (not saying this is better) is to have legacy.starmap.site that deploy the old version.