guix: Add flutter SDK

guix: Modify nodejs path

guix: Add environment variables for Java

guix: Use default ruby

guix: Remove emacs-robe

emacs: Remove settings for robe-mode and inf-ruby

emacs: Update custom.el

guix: Add emacs-hcl-mode

guix: Remove emacs-docker-tramp

guix: Remove the flyctl settings

guix: Upgrade ruby

emacs: Add the auto-mode setting for JSX.

Add `$HOME/bin` to PATH.

guix: Add xsel.

emacs: Set require-final-line to visit.

emacs: Add auto-save-visited-mode.

guix: Add nss-certs.

guix: Add flyctl command to PATH environment.

guix: Remove duplicate packages.

emacs: Remove company-idle-delay.