Munin-plot

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* Make series selection toggle buttons slightly lighter
* Switch from node-sass to sass package for processing SCSS files
* Various NPM package updates (includes fixes for a number of CVEs, none of
which should affect munin-plot because we don't supply untrusted content to
the affected components or don't use affected functionality)

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* Fix the order of items in the legend to match the Munin plugin order
* Allow better selections of items to show in the graph via buttons (select
all, select none and toggle selection) as well as focusing on a single item
through double click
* Various NPM package updates (includes fixes for a number of CVEs, none of
which should affect munin-plot because we don't supply untrusted content to
the affected components or don't use affected functionality)

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* Various NPM package updates (includes fixes for a number of CVEs, none of
which should affect munin-plot because we don't supply untrusted content to
the affected components or don't use affected functionality)
* Show a more helpful error if static files need to be built

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* Improve browser support for shareable link creation
* Try to support print CSS style (not really supported)
* Provide munin-plot source code as download from within application
* Various NPM package updates (this includes a fix for CVE-2021-44906 in the
minimist package which might end up in the built JavaScript code)

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* Support creating a shareable link that encodes the graph configuration
* Various NPM package updates

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* Fix date range picker to keep predefined date ranges current
* Support graphs with color references
* Fix part of legend being hidden
* Various NPM package updates