chore: update README and Dart files for improved submodule management and code organization

README.md

@@ -13,3 +13,22 @@ protections in place.
 
 1. Add the package as a submodule with
    `git submodule add <git-url> packages/<package-name>`
+
+## Remove a package
+
+1. Remove the submodule entry from `.gitmodules` file
+2. Remove the submodule entry from `.git/config`
+3. Run `git rm --cached packages/<package-name>`
+4. Remove the submodule directory: `rm -rf packages/<package-name>`
+5. Remove the submodule directory from `.git/modules/`: `rm -rf .git/modules/packages/<package-name>`
+6. Commit the changes: `git commit -m "Remove <package-name> submodule"`
+
+
+## Update submodules
+1. Run `git submodule update --remote --merge`
+2. Commit the changes: `git commit -am "Update submodules"`
+3. Push the changes: `git push origin main`
+4. If you have made changes to the submodules, make sure to push those changes to their respective repositories as well.
+
+## Remove Local Submodules
+1. Run `git submodule deinit -f -- packages/<package-name>`