Adds "Preprocess data with `recipes`" cheatsheet

<!-- Thank you for contributing a cheatsheet! 🎉 Cheatsheets are usually added in bursts so don't worry if your pull request sits for a little bit! Please fill out whichever section is relevant below and feel free to delete the irrelevant option. --> <!-- NEW OR UPDATED CONTRIBUTED CHEAT SHEETS --> <!-- Please fill out the fields below: --> ## Contributed Cheatsheet Information Cheatsheet Name: Preprocessing Data with `recipes` 1 sentence description of the contents: Cheatsheet of how to use `recipes` to pre-process data. It has several illustrations to help the user identify and understand what the given function does. Your Name (as you want to be credited on the website): Edgar Ruiz Date created/updated (Month YYYY format): 02 2026 <!-- Please keep the below portion in your pull request, and check `[x]` the applicable boxes. --> #### Please be sure you've included the [Creative Commons License](https://creativecommons.org/licenses/by/4.0/): - [x] Add CC-BY-SA Your Name to copywrite under the Creative Commons on the cheatsheet #### Check that you have done the following: - [x ] Used descriptive file names, something like package-name.pdf or task-name.pdf and did not include "cheatsheet" in the title. - [x] Included a PDF file of entire cheatsheet. - [x] Included a PNG file of the first page size 1100 x 850 in the pngs folder (for the website thumbnail). - [x] Included a Keynote or PowerPoint or similar file in the relevant folder (helps translators who want to translate your cheatsheet). #### Additional items included: - [x] Quarto file containing the web version of the cheatsheet under the `html/` page - [x] Added the name to the Quarto file to the list in the index page, so it'll be added to the rendered table