Cleanup gitignore

Sort alphabetically.
Separate specific files from files that should be ignored everywhere.
Add full path to specific files.

.gitignore

@@ -1,13 +1,14 @@
-archive
+*.bkp
 .gitignore
 !/.gitignore
-.zcompdump
 *.zwc
-_msg
+
-*.bkp
+/archive
-.netrwhist
+/.config/git/github.config
-github.config
+/.config/git/gitlab.config
-gitlab.config
+/.config/git/user.config
-example.config
+/.config/tmux/plugins
-.config/tmux/plugins
+!/.config/tmux/plugins/tpm
-!.config/tmux/plugins/tpm
+/.config/vim/.netrwhist
+/.config/zsh/.zcompdump
+/.config/zsh/plugins/completion/_msg