Add ONBOARDING, update TODO

ONBOARDING.md

@@ -0,0 +1,17 @@
+# Onboarding
+
+A checklist of reminders for myself when installing this dotfile configuration.
+
+When **bolded**, this application won't be installed automatically. It implies that I need to install it manually.
+
+- Required applications
+  - [ ] age
+  - [ ] rbw
+  - [ ] bw
+- Semi-required applications
+  - [ ] **hishtory**
+  - [ ] **zsh**
+  - [ ] **oh-my-zsh**
+- Preferred applications
+  - [ ] kitty
+  - [ ] micro

TODO.md

@@ -4,3 +4,5 @@
 - hishtory executable not available on init
 - add GPG key to bw
 - dracula theme tracking, kitty/micro
+- lazygit fix difftool
+- testing in github codespaces