[CI] Ensure spec processing works even if path contains a space

[chalin]

• Fixes Build fails when within a folder with spaces #5359
• My solution was to opt for relative paths inside of the cp-pages.sh script, and make the (very reasonable assuption) that the script is being run from the repo root. I can't recall why I opted for absolute path names. None of the directory names inside of the repo contain any spaces, so we're good.
• Closes fix: add qoutation marks around bash variables #5377 by superseding it
• I've tested this from inside a folder whose name contains a space and the build still works.
  @FatumaA, can you confirm (once this lands)?