Fix several broken links and console errors
To solve https://github.com/plotly/plotly.js/issues/6706
The issue is about a broken link. I used https://www.drlinkcheck.com/ to find all the broken links in https://plotly.com/javascript/. It only scanned the first 2000 links without paying. This PR fixes multiple issues
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'more controls' button doesn't need to exist as all control options are already displayed (there are 5). Subplots has 6 and we see the button
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inside a code block throws a console warning about un-escaped HTML - but if we escape it the link won't work. The link is v hidden anyway, imo it can be removed
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Fastly's logo is no longer at that URL and I couldn't find where it is
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main.css corrected a a typo. There is still an unclosed
{(line 9094) but closing it messes up the page CSS... Not obvious how to fix that -
swapped highlightBlock for highlightElement, to fix console warning. https://highlightjs.readthedocs.io/en/latest/api.html