Fix assets [skip ci]

assets/README.md

@@ -0,0 +1,94 @@
+This contains general base image assets for docs and such.
+
+- `logo.svg` is the logo source file, the base asset. It's an Inkscape SVG file, complete with relevant metadata.
+- `github-logo.png` is the logo export used for the GitHub profile picture.
+- `gitter-logo.png` is the logo export used for the Gitter avatar picture.
+- `16.png`, `32.png`, and `48.png` are the logo exports used for the favicon. They are generated separately by Inkscape as ImageMagick's output is horrendously blurry. (I don't get how such a powerful image manipulation library can be so bad at rasterizing an SVG file, but apparently it's possible.)
+
+In the docs, some of the logos are stored there directly rather than being first generated here.
+
+- `docs/logo.svg` is just the `logo.svg` here, but size-optimized with metadata and Inkscape-specific stuff such stripped. I generated this from Inkscape as it's easier than installing npm modules and there's little point in installing a whole development dependency just to minify one (already small) SVG file.
+- `docs/favicon.ico` is `16.png`, `32.png`, and `48.png` from here combined into a single `.ico` file.
+
+The other favicon file, `docs/favicon.png`, is simply copied from `32.png` directly.
+
+### Generating
+
+If you want to generate all these yourself from the originals and replicate everything for yourself:
+
+1. Open `assets/logo.svg` in Inkscape.
+
+1. Save an optimized SVG copy to `docs/logo.svg` with the following settings (irrelevant ones omitted):
+
+	- "Options" tab:
+		- Shorten color values: checked
+		- Convert CSS attributes to XML attributes: checked
+		- Collapse groups: checked
+		- Create groups for similar attributes: checked
+		- Keep editor data: unchecked
+		- Keep unreferenced definitions: unchecked
+		- Work around renderer bugs: checked
+	- "SVG Output" tab:
+		- Remove the XML declaration: unchecked
+		- Remove metadata: checked
+		- Remove comments: checked
+		- Embed raster images: checked
+		- Enable viewboxing: unchecked
+		- Format output with line-breaks and indentation: unchecked
+		- Strip the "xml:space" attribute from the root SVG element: checked
+	- "IDs" tab:
+		- Remove unused IDs: checked
+
+1. Export as a PNG to `assets/github-logo.png` with the following settings:
+
+	- Export area: page
+	- Image width: 500 pixels
+	- Image height: 500 pixels
+
+1. Export as a PNG to `assets/gitter-logo.png` with the following settings:
+
+	- Export area: page
+	- Image width: 96 pixels
+	- Image height: 96 pixels
+
+1. Export as a PNG to `assets/16.png` with the following settings:
+
+	- Export area: page
+	- Image width: 16 pixels
+	- Image height: 16 pixels
+
+1. Export as a PNG to `assets/32.png` with the following settings:
+
+	- Export area: page
+	- Image width: 32 pixels
+	- Image height: 32 pixels
+
+1. Export as a PNG to `assets/48.png` with the following settings:
+
+	- Export area: page
+	- Image width: 48 pixels
+	- Image height: 48 pixels
+
+1. Run the following ImageMagick commands from the repo's root:
+
+	```sh
+	magick convert assets/github-logo.png -background white -flatten assets/github-logo.png
+	magick convert assets/gitter-logo.png -background white -flatten assets/gitter-logo.png
+	magick convert -background none assets/16.png assets/32.png assets/48.png docs/favicon.ico
+	```
+
+1. Verify the icon has the expected sizes contained within it by running the following ImageMagick command from the root:
+
+	```sh
+	magick identify docs/favicon.ico
+	```
+
+	This should print something along the lines of this:
+
+	```
+	docs/favicon.ico[0] ICO 16x16 16x16+0+0 8-bit sRGB 0.000u 0:00.000
+	docs/favicon.ico[1] ICO 32x32 32x32+0+0 8-bit sRGB 0.000u 0:00.006
+	docs/favicon.ico[2] ICO 48x48 48x48+0+0 8-bit sRGB 15086B 0.000u 0:00.008
+	```
+
+1. Copy `assets/32.png` to `docs/favicon.png`.