Convert slides to articles

- [ ] Introduction - [ ] Variables - [ ] Convert string to number - [ ] libraries - [ ] Random - [ ] STDIN - [ ] Command line ARGV - [ ] Conditional operations and boolean values - [ ] Numbers - [ ] Constants - [ ] Characters - [ ] Strings - [ ] Loops - [ ] Tuples - [ ] Struct - [ ] Arrays - [ ] Vectors - [ ] HashMap - [ ] enums - [ ] files - [ ] path - [ ] rust types - [ ] functions - [ ] variable ownership - [ ] Error handling - [ ] Number guessing - [ ] Date and Time - [ ] Chrono - Datetime - [ ] CSV - [ ] Handlebars - [ ] Liquid - [ ] Packages and modules - [ ] Crates - [ ] testing - [ ] Threads - [ ] Regex - [ ] Sets - [ ] Command line with Clap - [ ] JSON - [ ] YAML - [ ] TOML - [ ] Iterators - [ ] Advanced functions - [ ] image - [ ] http - [ ] logging - [ ] execute external commands - [ ] macros - [ ] egui - [ ] sqlite - [ ] other