chore(config): set EDITOR/VISUAL defaults and update fish/zsh keybindings

dot_config/fish/conf.d/10-env.fish

@@ -18,6 +18,8 @@ set -gx CODE_ROOT $HOME/Developer
 # Git hosts (non-secret; tokens are in secrets.fish)
 set -gx GITEA_LOGIN code.sonr.org
 set -gx GITLAB_HOST git.sonr.org
+set -gx EDITOR nvim
+set -gx VISUAL nvim
 
 test -x /usr/bin/brave-origin-nightly; and set -gx BROWSER /usr/bin/brave-origin-nightly
 test -x /usr/bin/chromium; and set -gx CHROME_EXECUTABLE /usr/bin/chromium