assets are stale

I don't think the assets (icons) compile any more. No code generation occurs at compile time.
TODO: Fix by using embed fs:
```
//go:embed assetdir/*.html
//go:embed assetdir/*.png
var content embed.FS
```
the data bytes can then be read using
```
data, _ := content.ReadFile(name)
```
convert callers, hardcode string resource names instead of public funcs