Change icon color to match the primary color of the theme (i.e.,
`#3a65ab`). The new color looks good on both dark and light surfaces
which solves #155.
Introduce SVG logo instead of PNG for better quality and scalability.
Improve icon creation. Introduce an automated script to create different
logo formats in different sizes enabling easier update of logo from
single place.
It reduces distribution size to half of the size (50%) from 17.4 MB to
8.75 MB.
It follows new Vue default configuration vuejs/vue-cli#5232.
It drops support for `baidu 13.18`, `ie 11`, `ie 10`, `bb 10`, `bb 7`,
`ie_mob 11`, `ie_mob 10`, `op_mob 12.1` as reported by
`npx browserslist`.
