Fix expand/collapse all on site, make highlightjs lazier (#14038)

This fixes the buttons that expand/collapse all the lints in the list,
it also makes code block syntax highlighting only happen when the
specific lint enters the viewport since highlighting them all at once
was fairly heavy

There's also a few miscellaneous inline event handler removals

`script.js` and highlightjs are now loaded with `defer` so that the
download can start earlier

Also fixes https://github.com/rust-lang/rust-clippy/issues/14048, we
were calling highlight on the `pre` in `<pre><code>...</code></pre>` but
highlightjs wants us to call it on the `code` element

changelog: none

0 files changed, 0 insertions, 0 deletions