chore: remove requirements.txt in favour of pyproject.toml

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install -U pip
-          pip install -r requirements.txt
+          pip install -e ".[dev]"
       - name: Lint and check formatting
         run: |
           ruff check .

README.md

@@ -99,7 +99,7 @@ source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead sh
 #### Install dependencies
 
 ```sh
-pip install -r requirements.txt
+pip install -e ".[dev]"
 ```
 
 </details>

pyproject.toml

@@ -6,6 +6,7 @@ dependencies = [
     "slack-sdk==3.45.0",
     "slack-bolt==1.30.0",
     "slack-cli-hooks<1.0.0",
+    # If you use a different LLM vendor, replace this dependency
     "openai==3.29.0",
     "python-dotenv==1.2.4",
 ]