fix(mk): correct wget URL to download mast-web
docs(requirement): improve and link to sections
docs(installation): refactor to use install 'make' and 'wget' by default

Git is considered a secondary solution by my customer...
docs(check-system): update output
docs(install-infra): refactor section's title
refactor(deploy-webapp): fetch tar.gz instead of .zip
refactor(install-customer): remove this feature

Totally useless, I was just installing openssh-server which is already present