Internal-ize and fix all 18f.gsa.gov links #4136
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Pull request summary
This PR makes 2 changes.
First, it makes all links to 18f.gsa.gov pages internal. This makes all the internal site links checkable by the link checker, which can only check internal links. This first change made a lot of links' brokenness visible for the first time.
Next, it corrects broken links. For what I think was the majority of links, they just needed a trailing slash, or to be redirected, or to remove anchors that no longer exist even when the pages still do. But for places where the links are extremely broken — like they reference a project or 18F initiative from long ago — I added "(link removed)" so it wouldn't be too confusing to future readers.