[2.2.0] shadcn-vue integration and theme overhaul

This release brings a series of enhancements and refactors aimed at improving the functionality, maintainability, and overall design consistency of the Aruna website. This includes the integration of shadcn-vue as consistent component source, the partial replacement of the previous Preline based component and a nearly complete overhaul of the theme layout according to the Aruna CI guidelines.

Changes

• shadcn-vue integration by @das-Abroxas in #98
• Refactor registration modal by @das-Abroxas in #99
• Refactor credentials modal by @das-Abroxas in #100
• Refactor token modal by @das-Abroxas in #101
• Refactor search pagination by @das-Abroxas in #102
• Add maintenance mode by @das-Abroxas in #103
• Update global design layout by @das-Abroxas in #105
• Adapt colors to Aruna CI by @das-Abroxas in #106

Full Changelog: v2.1.1...v2.2.0