Broken links in readme

[YoraiLevi]

In paragraph 2.3
"2.3. How to use a BioContainer
BioContainers are listed in two main registries:

Docker Hub: Docker-based containers that can use the docker infrastructure.
QUAY Hub: Docker- and rkt-based containers that can use the rkt infrastructure.
For a full documentation about how to use BioContainers to perform bioinformatics analysis, please check the Full Documentation"
There are 3 broken links, docker hub, quay hub, docs.
I google this repository's name and found your docs and official site
https://biocontainers.pro
https://biocontainers-edu.biocontainers.pro/en/latest/

[osallou]

@ypriverol, the edu related web site has broken https certificate

[stianlagstad]

PR to fix some dead links: #358