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Readme updates for new version (OpenI6X#192)

* Readme updates for new version
* protocols
* Shutdown clarification.
* 16 channels
* telemetry sensors count
* added save icon explaination
* added nightlies info
* added Mode 1 info.

Merge pull request OpenI6X#137 from OpenI6X/janek/write-delay

Reduce eeprom write delay to 3s

Update README.md

Merge pull request OpenI6X#93 from OpenI6X/janek/circleci-bump-version

bump version on CI

Merge pull request OpenI6X#87 from OpenI6X/janek/i6x-elrs

Correct name + ELRSV2 screen update rate

Merge pull request OpenI6X#81 from OpenI6X/janek/1.1

OpenI6X 1.1 - to make it short

Merge pull request OpenI6X#79 from OpenI6X/janek/mega-baud-lower

Removed 3.75M Mega baud rate, improved OK label

CircleCI multiple pipelines attempt

CircleCI multiple pipelines attempt