chore: improve doc generation and test (#762)

Improve documentation generation and add tests for documentation.
Extend sphinx by todo directive.

The configuration table is now split into several tables. The test
is adapted accordingly.

There is a new test that checks the docstrings to be compliant to the
RST format as used by sphinx to create the documentation. We can not
use Markdown in docstrings. The docstrings are adapted accordingly.

An additional test checks that the documentation can be build with sphinx.
This test takes very long is only enabled in full run (aka. ci) mode.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

src/akkudoktoreos/prediction/weatherclearoutside.py

@@ -117,17 +117,25 @@ class WeatherClearOutside(WeatherProvider):
 
         Workflow:
             1. **Retrieve Web Content**: Uses a helper method to fetch or retrieve cached ClearOutside HTML content.
+
             2. **Extract Forecast Date and Timezone**:
-                - Parses the forecast's start and end dates and the UTC offset from the "Generated" header.
+                - Parses the forecast's start and end dates and the UTC offset from the "Generated"
+                    header.
+
             3. **Extract Weather Data**:
                 - For each day in the 7-day forecast, the function finds detailed weather parameters
-                and associates values for each hour.
-                - Parameters include cloud cover, temperature, humidity, visibility, and precipitation type, among others.
+                    and associates values for each hour.
+                - Parameters include cloud cover, temperature, humidity, visibility, and
+                    precipitation type, among others.
+
             4. **Irradiance Calculation**:
-                - Calculates irradiance (GHI, DNI, DHI) values using cloud cover data and the `pvlib` library.
+                - Calculates irradiance (GHI, DNI, DHI) values using cloud cover data and the
+                    `pvlib` library.
+
             5. **Store Data**:
                 - Combines all hourly data into `WeatherDataRecord` objects, with keys
-                standardized according to `WeatherDataRecord` attributes.
+                    standardized according to `WeatherDataRecord` attributes.
+
         """
         # Get ClearOutside web content - either from site or cached
         response = self._request_forecast(force_update=force_update)  # type: ignore