tweak: prep gitignore for v3

- Ignore generated profiles
- Ignore /{init,config,packages}.el, in case the user wants to use
  $EMACSDIR and their $DOOMDIR.
- Cast a wider net for auto-generated files (usually made when launching
  sandboxes, but this will happen less as the sandbox develops).

.gitignore

@@ -1,38 +1,55 @@
-.DS_Store
+# machine generated doom profiles or metadata
+/profiles/*
+!/profiles/*.org
+!/profiles/*@static/
+/.local*/
+
+# possible user config files
+/profiles.el
+/init.el
+/config.el
+/packages.el
+
+# generated by elisp packages in sub-directories
 *~
 *.*~
 \#*
 .\#*
-.local/
-.extension/
 *.cache*
 *.log
-/modules/private
-test/.local*/
-test/result
-
-# emacs tempfiles that shouldn't be there
-.dap-breakpoints
-.org-id-locations
-.tern-port
-.yas-compiled-snippets.el
-auto-save-list/
-cask/
-ede-projects.el
-elpa/
-eln-cache/
-network-security.data
-places
-semanticdb
-server/
-smex-items
-tramp
-transient/
-var/
-
-# compiled files
 *.elc
+*.eln
 *.lib
 *.fas
 *.dat
 *.eld
+*.rel
+*_archive
+*_flymake.*
+.dap-breakpoints
+.emacs.desktop
+.emacs.desktop.lock
+.org-id-locations
+.projectile
+.tern-port
+.yas-compiled-snippets.el
+flycheck_*.el
+
+# generated by elisp packages at root
+/.local/
+/.cask/
+/auto/
+/auto-save-list/
+/cask/
+/ede-projects.el
+/eln-cache/
+/elpa/
+/eshell/
+/network-security.data
+/places
+/semanticdb
+/server/
+/smex-items
+/tramp
+/transient/
+/var/