Swap in RTX (#1)

Reviewed-on: #1

install-todo.md

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+# installation
+
+## linux
+
+* Fail hard if no `apt-get`
+
+* Install linux-apt packges
+* install homebrew
+* source .zshenv
+  * how to check
+* install shared-brew packages
+* install alacritty
+* install alacritty terminfo
+* stow appropriate directories
+  * how to checck
+* toggle color mode
+
+## darwin
+
+* install homebrew
+* zprofile hack
+* source .zshenv
+* install shared-brew packages
+* install rosetta
+  * how to check?
+* install darwin-brew packages
+* install darwin-brew-cask packages
+* install tmux terminfo