Make the `-i` in invocations no longer required

All invocations require an input, and thus all must include -i (unless it uses stdin). Therefore, this version adds support for providing the input as an argument instead of an option. Thus, instead of ch -f server -i api.github.com, this version now allows to use ch -f server api.github.com.

Attached binary is for MacOS on an ARM64 CPU.