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* feat: update backend project links Replace solution and remix Glitch links with equivalent Repl.it links in backend projects/challenges and intro pages. * fix: link and Repl.it casing * fix: update mention of glitch in testing challenge * Apply suggestions from code review Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com> Co-authored-by: Mrugesh Mohapatra <1884376+raisedadead@users.noreply.github.com> Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>