* Updates link to documentation for device classes for sensors
* Updates link to documentation for device classes and state classes for binary sensors
* Updates link to documentation for device classes and state classes for buttons
* Updates link to documentation for device classes and state classes for covers
* Updates link to documentation for device classes and state classes for numbers
* Updates link to documentation for device classes and state classes for swtichs
* Remove duplicate on/off conditions in the core switch component
Replace covers with switches in the core switch component lambda calls section
Add a lambda calls section in the core fan component
* Update components/fan/index.rst
Co-authored-by: Chris Nussbaum <chris.nussbaum@protolabs.com>
Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl>