1. Fix not update phy according to country code.
2. Update regdomain max channel according to country info from nvs and or AP.
3. Change nvs default country from "CN" to "01".
4. Channel 14 is allowed only 11b mode.
5. Remove csa when switch channel from/to 14 channel.
6. Update phy mode nvs when softap channel from 14 to other.
7. Fix the bug that check whether channel parameter is valid.
Docs: change default country from "CN" to "01"
add the first part translated by joy
add the last part translated by huizi
solved some formatting issues and typos in en text
add updated cn translation based on peer review comments
updated based on technical review comments
add links to api functions
solve pipeline errors
convert line endings in cn file
solve some build errors
reedit a table