Update design doc with current tasks

docs/design.md

@@ -11,19 +11,27 @@
 ### Config
 
 #### ZSH
-
-- [ ] Clean up zshrc.
+- [x] Clean up zshrc.
   - There are a lot of pre-built tools now to manage plugins.
+- [x] Use antigen to install oh-my-zsh
+- [x] Use starship.rs as command line prompt
+- [ ] Customize starship.rs more using the toml config file.
+
 
 #### Vim
 
 - [ ] Vim plugin install is super slow and buggy
-- [ ] Simplify vim plugins.
-  - Many of them are no longer needed with newere tools like IntelliJ IDEA and VS Code.
+  - One of the solution is to use: vim-plug.
 - [ ] Move Vim/plugin manager from Vundle to SpaceVim
+- [ ] Simplify vim plugins.
+  - Many of them are no longer needed with newer tools like IntelliJ IDEA and VS Code.
 
 
 ### CI/CD
+- [ ] Optimize Dockerfile.
+  - Use lighter image. CI is really slow because it is pulling huge a whole ubuntu image.
+  - Build incrementally. Don't do operations that haven't changed in diff.
+  - Test using unit tests or something more local than docker build.
 
 #### Docker