feat: add initial base pages and mobile-first framework

.github/prompts/1-basepages.prompt.md

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+This project aims to create a playful online-tool to plan a date.
+In the end, there will be multiple pages that act like a choose-your-own-adventure story, where users can select different options to plan their ideal date
+
+A first, i need you to create a simple, mobile-first oriented style framework
+Most users will access the tool from their mobile devices, so the design should prioritize ease of use and readability on smaller screens
+
+the base color is some love-rose shade, with complementary colors that evoke warmth and romance. The typography should be clean and legible, with a focus on larger font sizes for headings and body text to enhance readability on mobile devices.
+
+I want you to create a few first pages:
+- a page where the user is asked if he/she wants to go on a date with me: with a yes and a no option. when the no-option is selected, the no-button shrinks to 66% of its original size. and the yes-button grows by 33% of its original size. That behaviour happens everytime the no-button is clicked. The page should have a playful and inviting design, with a heart-shaped background.
+
+- next page selects an activity for the date: options. for now its 
+  - Indisch essen gehen
+  - Kinofilm
+  - Film zu Hause + Essen bestellen
+  - Walk in the forrest
+  - Museum für gegenwartskunst
+  - Picknick auf der Wiese
+I want the selection to display in a grid structure, each activity has a central icon / simple image
+
+please create everything in german, but english code/classes/functions
+
+stay at plain html/css/javascript for now. that will be later extended by a simple solution to save it somehow to a database / storage/ textfile