Let only the default latest image : 7.7.0

yosifkit is totally right and after a team discussion, we let only the
default latest version on the official repository.
The AKS variant and previous versions maintenance will be on our
convertigo public repository.

library/convertigo

@@ -4,13 +4,4 @@ GitCommit: ff803d19e19d8be0712f16a39f07142c587e6a34
 
 Tags: 7.7.0, 7.7, latest
 Architectures: amd64
-Directory: docker/default
-
-Tags: 7.7.0-aks, 7.7-aks, aks
-Architectures: amd64
-Directory: docker/aks
-
-Tags: 7.6.6, 7.6
-GitCommit: cba10f7401396ca6249bad74ba041837077f9738
-Architectures: amd64
 Directory: docker/default