add treebranch-style visualization for strat variations

[zweek]

(I don't know how to implement this as of now)
I'm imagining a git-branch style graph where each strat is a node. variations of the same strat are next to each other and all flow into the next strat that happens afterwards chronologically.
This could be useful in visualizing things like the abyss sandwich, where skipping brute in ita1 requires you to do ash skip in ita3 differently, so certain nodes on this graph are connected and others aren't when the strats are mutually exclusive
Ideally each node in the visualization would also link to the corresponding page in the tutorial

[etsmit]

Mermaid is a great way to make flowcharts. You sacrifice some control over the final layout for the benefit of ease-of-use.

https://mermaid.live/edit