Improve metadata in pyproject.toml

- Update URLs
- Fix author formatting
- Adjust dependency group structure

Author: ThyMYthOS

pyproject.toml

@@ -3,11 +3,13 @@ name = "pystiebeleltron"
 dynamic = ["version"]
 description = "Python API for interacting with the Stiebel Eltron ISG web gateway via Modbus for controlling integral ventilation units and heat pumps."
 readme = "README.md"
+urls = { Homepage = "https://github.com/ThyMYthOS/python-stiebel-eltron", Issues = "https://github.com/ThyMYthOS/python-stiebel-eltron/issues" }
 authors = [
-    { name = "Manuel Stahl"},
-    { name = "'Martin Fuchs"}
+    { name = "Manuel Stahl" },
+    { name = "Martin Fuchs" },
 ]
 license = { file = "LICENSE" }
+keywords = ["stiebel-eltron", "tecalor", "modbus"]
 classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -23,7 +25,7 @@ dependencies = [
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
-[dependency-groups]
+[project.optional-dependencies]
 dev = [
     "jinja2>=3.1.6",
     "pytest>=8.3.5",