Move everything possible into XDG directories

With the help of xdg-ninja (https://github.com/b3nj5m1n/xdg-ninja)
we move all kinds of config/cache files into the XDG directories

.config/zsh/.zshenv

@@ -0,0 +1,40 @@
+# This file is sourced by zsh before ~/.zprofile and ~/.zshrc
+# (it's kind of a zsh-only ~/.profile file)
+
+
+export XDG_CONFIG_HOME="$HOME/.config"
+export XDG_DATA_HOME="$HOME/.local/share"
+
+
+export ZDOTDIR="$XDG_CONFIG_HOME/zsh"
+export ZSH="$XDG_DATA_HOME/oh-my-zsh"
+export ZPLUG_HOME="$XDG_DATA_HOME/zplug"
+export _Z_DATA="$XDG_DATA_HOME/z"
+
+
+# Use <Up> key to auto-complete a partially typed command
+# TODO: the coloring does not work when zsh-syntax-highlighting is loaded simultaniously
+# Source: https://github.com/zsh-users/zsh-history-substring-search/issues/131
+export HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_FOUND="fg=#ffffff,bg=#38761d,bold"
+export HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_NOT_FOUND="fg=#ffffff,bg=#990000,bold"
+
+
+# Notify about shorter aliases for typed commands
+# Source: https://github.com/MichaelAquilina/zsh-you-should-use
+export YSU_MESSAGE_POSITION="before"
+export YSU_MODE="BESTMATCH"
+
+
+# Suggest commands as one types
+# Source: https://github.com/zsh-users/zsh-autosuggestions
+export ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE="fg=#666666,bg=bold"
+export ZSH_AUTOSUGGEST_STRATEGY=(history completion)
+
+
+# Temporary files should go into ~/.cache
+export ZSH_COMPDUMP="${XDG_CACHE_HOME:-$HOME/.cache}/.zcompdump-$HOST-$ZSH_VERSION"
+
+
+# Automatically source ".env" files in folders
+# Source: https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/dotenv
+export ZSH_DOTENV_FILE=".env"