Add version toggle to download page

[rnsloan]

Fixes#321

• Add toggle
• remove top-right menu

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[fhemberger]

Wow, awesome! 👍

[bnb]

Rally rad! 👍

[lpinca]

It looks great.

[phillipj]

+:100:

[stevemao]

The images look awesome :) has anyone else tested this yet?

[diagramatics]

How about a different active color for LTS and stable, just to indicate which version the user is going to download easier?

[bnb]

@diagramatics I was looking at the gif, and noticed that the Windows/OS X/Source parts have a dark gray background on hover. Maybe that could be used?

[rnsloan]

@bnb like this?

[bnb]

@rnsloan Yes, except keep the bright green (from the previous version) for the active state.

Notice how the gray background is only visible on hover for the Windows/Mac/Source buttons. Like that, except with the green background as an active state.

[rnsloan]

Colors updated. Merging.

[phillipj]

👯 nice work!

[bnb]

Good job. Looks awesome live!

[stevemao]

Perfect, Thanks @rnsloan :)