refactor(scripts): inline cargo packages into install script

Move package list from config/asdf/cargo-packages into
install-cargo-packages.sh as a bash array and remove the
external file. Update documentation accordingly.

config/asdf/cargo-packages

@@ -1,27 +0,0 @@
-// A cargo subcommand for checking and applying
-// updates to installed executables
-cargo-update
-// Cargo cache management utility
-cargo-cache
-// An incremental parsing system for programming tools
-tree-sitter-cli
-// a subprocess caching utility
-bkt
-// a structural diff that understands syntax
-difftastic
-// A simple, fast and user-friendly alternative to 'find'
-fd-find
-// recursively searches directories for a
-// regex pattern while respecting your gitignore
-ripgrep
-// A version manager for neovim
-bob-nvim
-// bottom, btm - A cross-platform graphical process/system monitor with
-// a customizable interface and a multitude of features.
-bottom
-// A modern alternative to ls
-eza
-// Tmux Sessionizer: A tool for opening git repositories as tmux sessions
-tmux-sessionizer
-// zoxide, a smarter cd command
-zoxide