Split index.vue into smaller components

[friuns2]

Related to #1

Refactors the pages/index.vue component by splitting it into smaller, reusable Vue components for better maintainability and readability.

• Adds three new Vue components: AttractionList.vue, MapView.vue, and AttractionDetails.vue, each encapsulating parts of the functionality previously contained within pages/index.vue.
• Moves relevant template, script, and style sections related to the attractions list, map view, and attraction details from pages/index.vue to the respective new components.
• Updates pages/index.vue to import and use the newly created components, removing the now redundant code sections.
• Modifies the README.md to include a section on the new component-based architecture, explaining the structure and benefits of splitting the code into components and guiding developers on how to extend or modify components for future features.

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