Download network including legend, misc fixes

[vincerubinetti]

• replace react-to-text with more maintained react-children-utilities
• add dom-to-image-more package for "screenshotting" DOM elements
• refactor network code a bit for readability
• have download feature include the legend, instead of just the network canvas. this sacrifices having transparency in downloaded PNGs, but hopefully that is an okay sacrifice. the network does react to dark mode changes, so you can make figures for dark slide backgrounds for example.
• refactor download util funcs to separate downloading and url-ifying functionality

[netlify[bot]]

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