GitLab

* use https everywhere

* use https links on the files that are left

Also, removed some broken links and updated redirections.

Fixes #6758

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

Not everyone uses rvm and the library has already got a function for this.

Add spaces before bullet-points to more easily distinguish them from one another and the rest of the prompt when using smaller font-sizes and do not add a blank line prior to prompt output; if there's a desire for spacing, one can use their terminal's line-height to achieve this.