Improve download page

This brings back much of the old look and feel of the old installation page.

We also link to https://www.haskell.org/documentation/ in the "Getting started" page and at the end of the ghcup installation script.

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@arjun

added 1 commit

• 22e30fe5 - Fix some https links

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changed the description

really like it

added 3 commits

• f137d5cc - Bring back the original install look&feel with platform detection
• 1f100623 - Link to Haskell documentation after installation
• c0c6cd4f - Fix some https links

Compare with previous version

mentioned in merge request !202 (closed)

added 7 commits

• 237ed173 - format extra.css with 2 spaces uniformly for readability
• 6b0c9150 - align the top haskell logo and "GHCUP" text correctly
• 569b46f0 - improves the look of central download box
• 2cb40af6 - make donate button primary call-to-action, move it above-the-fold for
• ae85f715 - Close the link, otherwise it spans to the bottom of the page
• d19602d0 - Reduce donate button size a bit
• 940b5842 - Add "Get help" section

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Excellent... anything else?

The bottom bar could be improved and the typography could be a tad bit better. none of those are blocking.

i'll have to sit with it someday and comb all the pages for nits and improvements when i have some time. The way we write and structure html could also be much better, again, non-blocking.

merged