message: Fix paths in ide/README
  Previously, paths in markdown links were incorrectly pointing to non-existent directories at repo root. This commit fixes them to link to existing subdirectories relative to the Readme file they're in.
diff: The Enso IDE is responsible for providing an interactive and visual programming
  experience to Enso's users. It is divided into two major components:
  -- [Client](/client)
  -- [GUI](/gui)
  +- [Client](client/)
  +- [GUI](gui/)
  