fix: easier copy/paste of package name and version

[sgammon]

Summary

At the moment, it can be difficult on BCR to copy only the package name or version value, rather than the full code snippet. By adding an   between the two <span>s and applying a small CSS fix, the selection can be bounded by the package name and version rather than copying both.

The effect is subtle but makes it much easier to copy/paste from these values, see below:

Before:

After:

Changelog

• fix: add non-breaking space between package name and version to allow for copying/pasting each one easily
• fix: add css declaration to make copy/paste easier for package name and version

[sgammon]

Here are a pair of videos of the old vs new behavior in action (this PR only deals with selection, it doesn't put the value on the clipboard). Note that all clicks here are single-clicks in the new video.

Before:

https://github.com/bazel-contrib/bcr-ui/assets/171897/c41e7d29-a8e5-4a16-837d-c98f3b260f74

After:

https://github.com/bazel-contrib/bcr-ui/assets/171897/47284e66-33ea-4219-9046-3a3802528290

[sgammon]

@hobofan new to tailwind, thank you for these pointers; will adjust