Upgrade to BootstrapV4

[amoraitis]

Let´s upgrade the project´s bootstrap to 4 and make the required changes to the website to be functional!

The process is written here, step-by-step.

[mariombaltazar]

Hi,
Can i contribute with this issue?

[amoraitis]

@mariombaltazar Of course, follow my article here. I am waiting for your PR

[mariombaltazar]

@mariombaltazar Of course, follow my article here. I am waiting for your PR

Thanks @amoraitis

[pirland]

I'll take a wack at this, if nobody else is working on it.

[amoraitis]

@pirland keep in mind that current version of bootstrap is 4,we just want to update obsolete references to css classes. I have mentioned some in the article.
Tahnks

[pirland]

This should be taken care of. #51

[bsimser]

What's outstanding on this? #51 was merged in so what's left to do to close this?