Fix URLs for pages whose titles have changed

[yndajas]

Two of these had changed title such that the URL was a little misleading; the third was close enough but is updated for accuracy

Including redirects for all the former URLs despite the slight change in scope for two of them

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In case it helps future developers, I found these by:

cd src
grep --recursive "title:" about-us commercial-ops contributing delivery-management design govpress-unit leadership product-management sales-and-marketing staff-handbook tech user-research work-we-do
irb

In IRB, to create a list of instances where the case-normalised filename (or folder name if the file is an index) and page title don't match

File.readlines("paths_and_titles").map { _1.chomp.sub("/index", "").split("/").last.gsub("-", " ").downcase.split(".md:title: ") }.select { _1.first != _1[1] }

Lastly, manually inspect the list and look for mismatches that could be misleading

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