Cleanup: remove .gitmodules and add .github/ before subtree add

.github/prompts/plan-graphicsComponentsSrc.prompt.md

@@ -0,0 +1,49 @@
+# Plan: Convert Submodule to Git Subtree for graphics-components-src
+
+## 1. Remove the submodule (if present)
+- Remove the submodule and its config:
+  ```sh
+  git submodule deinit -f graphics-components-src
+  git rm -f graphics-components-src
+  rm -rf .gitmodules
+  ```
+
+## 2. Add the upstream repo as a remote (if not already)
+- Add the original repo as a remote:
+  ```sh
+  git remote add upstreamRepo https://github.com/reuters-graphics/graphics-components.git
+  git fetch upstreamRepo
+  ```
+
+## 3. Add the code as a subtree
+- Import the code into your repo:
+  ```sh
+  git subtree add --prefix=graphics-components-src upstreamRepo main --squash
+  ```
+  - Replace `main` with the correct branch name if needed.
+
+## 4. Make your own changes
+- Edit files in `graphics-components-src` as needed.
+- Commit your changes as normal.
+
+## 5. Pull in upstream changes later
+- When you want to update from upstream:
+  ```sh
+  git fetch upstreamRepo
+  git subtree pull --prefix=graphics-components-src upstreamRepo main --squash
+  ```
+  - Resolve any conflicts and commit.
+
+## 6. Push your repo as normal
+- All code (including the subtree) is in your repo.
+- Push as usual:
+  ```sh
+  git push
+  ```
+
+---
+
+**Summary:**
+- Use `git subtree add` to import the code.
+- Use `git subtree pull` to update from upstream.
+- Make and commit your own changes as usual.