docs: Update README for Ecowitt pre-release, expanded sensor support, and guidance
Update the README to reflect current development and provide clearer user guidance:
- Announce active Ecowitt support in the v2.0.0pre1 pre-release version.
- Expand the "Supported sensors" section with details on WSLink protocol specific sensors,
including additional channels (CH2/CH3), WBGT, heat index, wind chill,
sensor battery levels, and HCHO/VOC air-quality sensors (WH46).
- Clarify WSLink configuration, warnings, and quick recommendations.
- Correct the manual installation path for custom components and improve general readability.
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Adds download badges to the README for better visibility
and includes zip release and filename options in the HACS
manifest to enable direct downloads through HACS.
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Celer21