Clearify recommended vs no longer recommended adapters

[Hedda]

Replaces #572 and clarifies recommended versus older adapters no longer recommended for new purchase (for new users).

• Matches PR Clearify recommended vs no longer recommended adapters zigpy-deconz#251 (for zigpy-deconz), and PR Clearify recommended vs no longer recommended adapters zigpy-znp#242 (for zigpy-znp

Note! Recommendations not accepted in ZHA docs unless info come from project -> home-assistant/home-assistant.io#31839

Downstream project again want this information to be provided in upstream, see also home-assistant/home-assistant.io#17089

Point is that older deconz adapter so not longer be seen as recommended for new purchase by those that are new to ZHA/zigpy.

If want older hardware/firmware to be seen as support but legacy then Home Assiatant devs want this to be stated upstream.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.68%. Comparing base (b008ccf) to head (4f1a392).

❗ Current head 4f1a392 differs from pull request most recent head c6aae31. Consider uploading reports for the commit c6aae31 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #614      +/-   ##
==========================================
- Coverage   99.72%   99.68%   -0.05%     
==========================================
  Files          74       74              
  Lines        4812     5014     +202     
==========================================
+ Hits         4799     4998     +199     
- Misses         13       16       +3     

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