[Docs]: rework documentation

[AndreasAugustin]

Describe the documentation issue

currently within the docs there are several spelling and grammatical issues.
Those need to be corrected.

The whole documentation needs a rework (including the gifs)

Links

https://github.com/AndreasAugustin/go-gitmoji-cli

Acknowledgements

• I may be able to submit a pull-request to fix this issue.