refactor(ops/nixos): Move my NixOS configurations to //users/tazjin

NixOS modules move one level up because it's unlikely that //ops/nixos
will contain actual systems at this point (they're user-specific).

This is the first users folder, so it is also added to the root
readTree invocation for the repository.

Change-Id: I546c701145fa204b7ba7518a8a56a783588629e0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/244
Reviewed-by: tazjin <mail@tazj.in>

users/tazjin/dotfiles/config.fish

@@ -0,0 +1,40 @@
+# Configure classic prompt
+set fish_color_user --bold blue
+set fish_color_cwd --bold white
+
+# Enable colour hints in VCS prompt:
+set __fish_git_prompt_showcolorhints yes
+set __fish_git_prompt_color_prefix purple
+set __fish_git_prompt_color_suffix purple
+
+# Fish configuration
+set fish_greeting ""
+set PATH $HOME/.local/bin $HOME/.cargo/bin $PATH
+
+# Editor configuration
+set -gx EDITOR "emacsclient"
+set -gx ALTERNATE_EDITOR "emacs -q -nw"
+set -gx VISUAL "emacsclient"
+
+# Miscellaneous
+eval (direnv hook fish)
+
+# Useful command aliases
+alias gpr 'git pull --rebase'
+alias gco 'git checkout'
+alias gf 'git fetch'
+alias gap 'git add -p'
+alias pbcopy 'xclip -selection clipboard'
+alias edit 'emacsclient -n'
+alias servedir 'nix-shell -p haskellPackages.wai-app-static --run warp'
+
+# Old habits die hard (also ls is just easier to type):
+alias ls 'exa'
+
+# Fix up nix-env & friends for Nix 2.0
+export NIX_REMOTE=daemon
+
+# Fix display of fish in emacs' term-mode:
+function fish_title
+  true
+end