document clipart resouces

[nodejs markdownlint]: https://github.com/DavidAnson/markdownlint

[codespell]: https://github.com/codespell-project/codespell/

### Charts

### Charts and diagrams

We currently use [Graphviz](https://graphviz.org/) to draw charts, but have also used

[Diagrams.net](https://www.diagrams.net/) (formerly `draw.io`). Other alternatives:

TODO: make a section about diagrams, how to make them, why they are

useful, etc. See [this for inspiration](https://sportebois.medium.com/better-architecture-diagrams-for-agile-teams-actionable-tips-and-lessons-e76627dc4315).

Normal graphic design tools like Inkscape, Dia, Krita and Gimp can of

course be used for this purpose. Ideally, an editable and standard

vector format (e.g. SVG) should be used for future proofing.

For this, clipart and "symbols" can be useful to have reusable

components in graphs. A few sources:

 * [inkscape-open-symbols](https://github.com/PanderMusubi/inkscape-open-symbols) ([Debian package](https://tracker.debian.org/inkscape-open-symbols)): ships a bunch of

   icons from multiple sources (e.g. Font Awesome) directly usable in

   Inkscape, lacking a few which are suggested [IMKL](https://github.com/PanderMusubi/inkscape-open-symbols/issues/91), [OSA](https://github.com/PanderMusubi/inkscape-open-symbols/issues/38),

   [Visio-like](https://github.com/PanderMusubi/inkscape-open-symbols/issues/25)

 * [Free SVG](https://freesvg.org/): SVG vector files CC0

 * [Feather icons](https://feathericons.com/): more icons than symbols or clipart, MIT

 * [SVG repo](https://www.svgrepo.com/)

 * [Lucide](https://lucide.dev/): Icons, ISC license

 * [Icon Buddy](https://iconbuddy.app/): icons, various licenses

 * [Hero icons](https://heroicons.com/): icons

 * [AWS icons](https://awsicons.dev/)

 * [Google icons](https://cloud.google.com/icons)

Note that Inkscape has rudimentary routing with the [connector tool](https://wiki.inkscape.org/wiki/Connector_tool_tutorial).