avatar: Port to use HandyAvatar

So that we follow HIG and we can keep chatty-avatar simple
7 jobs for master in 10 minutes and 20 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Build
passed #341825
librem5
build-pureos-gcc-byzantium

00:02:47

 
  Test
passed #341827
librem5
check-po

00:00:23

passed #341826
librem5
test:debian-gcc

00:02:03

23.2%
 
  Package
passed #341828
librem5
package-pureos-byzantium

00:02:29

passed #341829
librem5:arm64
package-pureos-byzantium:arm64

00:05:30

 
  Test Package
passed #341830
librem5
autopkgtest-pureos-byzantium-package

00:01:18

passed #341831
librem5
lintian-pureos-byzantium-package

00:00:47