* Upgrade to https: serving for JSON, links in docs
Fixes#5480
* Update boards.rst documentation
* Update more documentation http: refs to https:
* Remove obsolete staging info
* Drop obsolete versions from JSON programatically
After the final merge is done on the JSON, strip out any named versions
from the final product.
Removing 1.6.5-* and 2.5.0-beta(1,2,3) for now.
* Remove 2.4.0-rc(0/1) from JSON, too
* Add information about the max_connection constructor argument.
* Correct information about max soft-AP connections.
* Add information about what happens when max_connection is reached.
* Correct terminology
* - Correct the valid range of max_connection to 1 - 8.
- Include reference.
