Swap Explorer and Docu Link. Change 'Build On Koinos' into 'Documents'

[MiXiBo]

Brief description

Checklist

• [ x] I have built this pull request locally
• [ x] I have ran the unit tests locally
• [ x] I have manually tested this pull request
• [ x] I have reviewed my pull request
• [ ] I have added any relevant tests

Demonstration

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[jredbeard]

I like this change from @MiXiBo. It swaps the buttons around so "Go to the Explorer" is at the top and the other button simply says "Documentation" pointing to the new docs. What do you think @sgerbino @brklyn8900 ?

[MiXiBo]

It may be even better to have a button like 'Start Developing' or 'Start Building' but we are not that far yet to have an in-browser IDE. 'Start Building' can work too with a link to the docu... not sure what you like better 'Start Building' or 'Documentation'?

Documentation may be good .. as those action items may not sound good when they end with ..ing

[sgerbino]

Closing due larger site overhaul