Remove symlinks pointing at files deleted upstream years ago

.aprc, .escaped_colors.rb and .unescaped_colors.rb were tracked at the repo
root as symlinks (mode 120000) to .yadr/irb/<file>. Two things were wrong:

  - Those targets were deleted upstream in 9aac908 (Colorized irb prompt).
    Only irb/pryrc survives, so the links could never resolve.
  - The target path is relative to the link's own directory, so from inside
    the repo they resolved to ~/.yadr/.yadr/irb/... They only ever made sense
    sitting in $HOME, not committed into the repo root.

install.sh was still deploying five dead entries: those three plus .editrc
and .inputrc, which belonged to vimify and went away with it. A re-bootstrap
would have recreated all five as dangling links.

The matching broken links in /root and /home/dissimulo are removed too, along
with .steampath, which pointed at a steam binary that is not in .steam/sdk32
(Steam recreates it on launch).

install.sh

@@ -25,8 +25,8 @@ PERSONAL_FILES=(
   .zshenv.backup .zshrc.backup
   # Relative symlinks into .yadr/... — YADR's rake install creates equivalents,
   # but we deploy these too so things work even if rake install is skipped.
-  .aprc .ctags .editrc .escaped_colors.rb .gemrc .gitconfig .inputrc .pryrc
-  .rdebugrc .unescaped_colors.rb .zlogin .zlogout .zpreztorc
+  .ctags .gemrc .gitconfig .pryrc
+  .rdebugrc .zlogin .zlogout .zpreztorc
   .zprofile .zshenv .zshrc
 )