chore: revert pyproject.toml to tool config only, keep requirements.txt for now

Author: srtaalej

README.md

@@ -76,7 +76,7 @@ source .venv/bin/activate  # for Windows OS, .\.venv\Scripts\Activate instead sh
 #### Install dependencies
 
 ```sh
-pip install .
+pip install -r requirements.txt
 ```
 
 </details>

pyproject.toml

@@ -1,13 +1,3 @@
-[project]
-name = "bolt-python-starter-template"
-version = "0.1.0"
-requires-python = ">=3.9"
-dependencies = [
-    "slack-sdk==3.41.0",
-    "slack-bolt==1.28.0",
-    "slack-cli-hooks==0.3.0",
-]
-
 [tool.ruff]
 line-length = 125
 exclude = [".venv", "venv"]