Also improves the slug editing experience by partially-slugifying the
value as it's entered.
Previously, submitting a org slug value of ".." or similar would cause
the frontend to redirect to a "page not found" page, with all accessible
links leading to only `/account/settings`. This also causes the backend
to reset the org slug to one generated from the org name on a reload.
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Co-authored-by: sua yoo <sua@webrecorder.org>
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