Configure mackup

- ignore apps whose config files are in the dotfiles repo already
  (see: https://gitlab.webartifex.biz/alexander/dotfiles)
- ignore ~/.password-store as it contains symlinks
- sync various (config) files that are not be public:
  + Cisco's AnyConnect
  + history files for bash, less, python, psql, tig, and zsh
  + Gnome Nautilus' bookmarks
  + SSH config

.mackup/README.md

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+# Configuration for `mackup`
+
+This folder contains various **config** files
+    to make [`mackup`](https://github.com/lra/mackup)
+    synchronize (dot) files the general public should *not* see.
+Their format is described [here](https://github.com/lra/mackup/tree/master/doc#add-support-for-an-application-or-almost-any-file-or-directory).

.mackup/anyconnect.cfg

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+[application]
+name = Cisco's AnyConnect
+
+[configuration_files]
+.anyconnect

.mackup/histories.cfg

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+[application]
+name = various history files
+
+[configuration_files]
+.bash_history
+# .lesshst -> less overwrites the symlink unfortunately
+.python_history
+.tig_history
+.zhistory
+
+[xdg_configuration_files]
+# ~/.config/psql is set in ~/.psqlrc for all history files
+psql

.mackup/nautilus.cfg

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+[application]
+name = Gnome Files a.k.a. Nautilus
+
+[xdg_configuration_files]
+gtk-3.0/bookmarks

.mackup/ssh_private.cfg

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+[application]
+name = private SSH (config) files
+
+[configuration_files]
+.ssh/config