feat: hide wakatime languages (#1212)

* feat: added option to hide languages

* feat: recalculate percentages for hidden languages

* refactor: reverted langs_count and did some formatting

* doc: added hide to readme

* feat: make languages var mutable and improve filter logic

Co-authored-by: Adrian Kunz <clashsoft@hotmail.com>

* refactor: improve code and added tests

Co-authored-by: Adrian Kunz <clashsoft@hotmail.com>
Co-authored-by: Anurag <hazru.anurag@gmail.com>