dotfiles/zshrc: update

Remove unused Kitty and ASDF variables, and export SSH_AUTH_SOCK.

dotfiles/zshrc

@@ -37,7 +37,6 @@ if [[ "$OSTYPE" =~ ^linux.*$ ]]; then
         # 2021-06-22: fix "Firefox is already running" message
         # See: https://mastransky.wordpress.com/2020/03/16/wayland-x11-how-to-run-firefox-in-mixed-environment/
         export MOZ_DBUS_REMOTE=1
-        export KITTY_ENABLE_WAYLAND=1
         export QT_QPA_PLATFORM=wayland-egl
         export CLUTTER_BACKEND=wayland
         # 2020-02-10: https://github.com/swaywm/sway/wiki#issues-with-java-applications
@@ -49,10 +48,6 @@ fi
 {%@@ if profile == "balozi" @@%}
 # Enable asdf version manager zsh completions
 . /opt/asdf-vm/asdf.sh
-# Enable setting JAVA_HOME, requires the asdf-java plugin installed for this
-# user. Currently disabled because it adds a noticeable lag to the shell
-# See: https://github.com/halcyon/asdf-java 
-#. ~/.asdf/plugins/java/set-java-home.zsh
 {%@@ endif @@%}
 
 alias ls='ls -F --color=auto'
@@ -62,7 +57,6 @@ alias less='less -R' # preserves colors in GNU coreutils' `less`
 # see: https://github.com/jan-warchol/selenized/tree/master/other-apps/dircolors
 export LS_COLORS="$LS_COLORS:ow=1;7;34:st=30;44:su=30;41"
 
-
 # Environment
 export PS1='[%n@%m: %~]$ '
 export EDITOR=vim
@@ -103,6 +97,8 @@ export GPG_TTY=$(tty)
 # Refresh gpg-agent tty in case user switches into an X Session
 gpg-connect-agent updatestartuptty /bye >/dev/null
 
+export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/ssh-agent.socket"
+
 # Speed up JVM start for short-lived Java programs
 # See: https://zeroturnaround.com/rebellabs/your-maven-build-is-slow-speed-it-up/
 export MAVEN_OPTS="-XX:+TieredCompilation -XX:TieredStopAtLevel=1"