icon: support svg, webp and optimization

[Atinux]

It would be nice to also support static/icon.svg is available, I think we could use sharp for transformation.

const sharp = require("sharp")

sharp('static/icon.svg')
  .png()
  .toFile("{buildDir}/icon.png")
  .then(function(info) {
    console.log(info)
  })
  .catch(function(err) {
    console.log(err)
  })

[pi0]

Actually we use jimp-lite for PWA module to reduce installation requirements. Supporting sharp if installed could be nice feature since this way we may also optimize and reduce size as well.

[Coinhexa]

It would be nice to also support static/icon.svg is available, I think we could use sharp for transformation.

const sharp = require("sharp")

sharp('static/icon.svg')
  .png()
  .toFile("{buildDir}/icon.png")
  .then(function(info) {
    console.log(info)
  })
  .catch(function(err) {
    console.log(err)
  })

Sorry this is not very clear
As per the documentation I cannot find the icon accepting a callback function to supply a bunch of icons anywhere so where do you put all this code?