Add hardware documentation for the VOLOLAND NarinFC-H7 flight controller
including pinouts, serial port mapping, PWM output groups, and analog
inputs. Fix version badge to v1.17 and clarify RC_IN is wired directly
to FMU via RC_INPUT driver.
Based on work by @vololand and @hamishwillee from PR #26542.
Signed-off-by: Ramon Roche <mrpollo@gmail.com>