wordpredictor 0.0.3

Bug fixes

Disabled caching in R Markdown files, because it was causing problems with CRAN checks.

Fixed small bugs that were causing problems with GitHub actions and CRAN checks.
Removed custom .Rprofile file as it was causing problems with GitHub actions.
Updated sample code in features.Rmd vignette so it does not cause issues with R CMD Check on MacOs.
Removed inst/extdata folder from .gitignore since it was causing problems with check-standard workflow on GitHub.
Removed non-standard characters from example in data-cleaner.R file as they were causing problems with CRAN check on “Debian Linux, R-devel, clang”.
Issues related to the bug fixes: #318, #319, #320