Improve landing page - topic cloud, SJS/SN/scala highlights

[keynmol]

Commence the bikeshedding!

Main changes:

• Denoise the tag cloud, by removing parentheses and moving library count into superscripts
• Highlight current versions of Scala, SJS, SN, SBT/Mill - older versions are relegated into much smaller space, to not create the impression that all are equally prominent

Before:

After (note that local data doesn't have mill plugins, so it's not showing up)

[sjrd]

Looks nice. Two small suggestions.

[julienrf]

Thank you @keynmol for working on this PR! I like the new tag cloud, and I like the fact that we emphasize stable versions of Scala, sbt, etc., but I feel like the logos take too much space and overall the content is misaligned.

[keynmol]

but I feel like the logos take too much space and overall the content is misaligned

I agree about the misalignment, let me try to flex a bit more.

With regards to logos, I could make them smaller - in particular I think if the Scala logos will be same size (or actually smaller) than the scalajs/native ones, it will look cleaner.

Will do another pass, and if it's a no go - will remove them completely.

[bishabosha]

Wow so cool, thanks! My small comment (looking at the screenshot): I'd prefer if the "project count" and "other versions" for Scala.js and Scala Native were on their own lines and aligned

[keynmol]

Logos were too fiddly to get right, they all have different sizes and different empty space around them.

• Removed the logos and descriptions
• greyed out versions that are truly deprecated
• Centered everything
• Projects and versions are separate paragraphs

[julienrf]

Thank you again for your work! The screenshot looks good to me!

Do you mind posting screenshots for various sizes of screens (especially tablet and mobile)?

[keynmol]

@julienrf I took a few screenshots - seems fine at first sight.

On really narrow things we can add a media query and just flex the entire list into a single column, but imo there's not many screens around with a resolution that low to care :)

[keynmol]

@julienrf anything else you would want to change here?

I still think that even this (toned down) version is an improvement, but I'm happy to adjust if you have any more ideas :)

[adpi2]

Thanks a lot @keynmol for this great proposal and for implementing it. It is very much welcome. Scaladex deserves a better front page and unfortunately we did not find much time to work on it.

I left a few comments about the code style. Here are a few more comments about the design itself:

• I think we can remove the deprecated information, to improve the readability. Because currently it is hard to understand that the style of 2.12 is different because 2.12 is not deprecated.
  
• I would expect the "181 projects" to be clickable as part of the "Scala 2.13" box, because clicking on "Scala 2.13" brings to the list of projects.
• I don't like the "Build tool plugins" title floating alone in the middle of the page. It would be more consistent if we also put titles above the Scala versions and the platform versions. But I would not mind putting no titles at all. Anywhere else on Scaladex, sbt and Mill are considered platforms, in the same way as Scala.js and Scala Native.

Those comments are open to discussion. Also if you don't want to implement the changes now, I would be okay to merge and improve later.

[adpi2]

For testing, I deployed this PR to the dev environment: https://index-dev.scala-lang.org/

[adpi2]

I am taking this PR over to push it to the finish line.