feat: implement env-dataset; update nix and go

flake.lock

source/go.mod

source/go.sum

source/html/generate.go

source/javascript/generate.go

source/vendor/github.com/charmbracelet/x/ansi/background.go

source/vendor/github.com/charmbracelet/x/ansi/c0.go

source/vendor/github.com/charmbracelet/x/ansi/charset.go

source/vendor/github.com/charmbracelet/x/ansi/color.go

source/vendor/github.com/charmbracelet/x/ansi/csi.go

source/vendor/github.com/charmbracelet/x/ansi/ctrl.go

source/vendor/github.com/charmbracelet/x/ansi/cursor.go

source/vendor/github.com/charmbracelet/x/ansi/cwd.go

source/vendor/github.com/charmbracelet/x/ansi/dcs.go

source/vendor/github.com/charmbracelet/x/ansi/focus.go

source/vendor/github.com/charmbracelet/x/ansi/graphics.go

source/vendor/github.com/charmbracelet/x/ansi/iterm2.go

source/vendor/github.com/charmbracelet/x/ansi/keypad.go

source/vendor/github.com/charmbracelet/x/ansi/kitty.go

...e/vendor/github.com/charmbracelet/x/ansi/kitty/decoder.go