Clearify recommended vs no longer recommended adapters

[Hedda]

Replaces https://github.com/zigpy/bellows/pull/572 and clarifies recommended versus older adapters no longer recommended for new purchase (for new users).

• Matches PR https://github.com/zigpy/zigpy-deconz/pull/251 (for zigpy-deconz), and PR https://github.com/zigpy/zigpy-znp/pull/242 (for zigpy-znp

Note! Recommendations not accepted in ZHA docs unless info come from project -> https://github.com/home-assistant/home-assistant.io/pull/31839

Downstream project again want this information to be provided in upstream, see also https://github.com/home-assistant/home-assistant.io/pull/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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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

```diff @@ 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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