Improve documentation, switch from vuepress to vitepress

[SamBrishes]

VitePress is the new VuePress, thus switching to the new static-site generation should be considered + improve documentation in general, especially with the upcoming new features and options.

See

• https://vitepress.dev/
• https://vitepress.dev/guide/what-is-vitepress#what-about-vuepress

---

• [x] Switch from VuePress to VitePress
• [ ] Homepage
• [ ] Guide
  • [x] Introduction
    • [x] Getting Started
    • [x] Installation
    • [x] Configuration
  • [ ] Usage
    • [ ] Properties
    • [ ] Categories
    • [ ] Products & Variants
    • [ ] Virtual Products
    • [ ] Reviews
    • [ ] Services
    • [ ] Currencies
    • [ ] Taxes
    • [ ] Payment Methods
    • [ ] Shipping Methods
    • [ ] Analytics
    • [ ] Going Live
  • [ ] Components
    • [ ] MallDependencies
    • [ ] Product
    • [ ] Products
    • [ ] ProductsFilter
    • [ ] ProductReviews
    • [ ] Cart
    • [ ] DiscountApplier
    • [ ] Checkout
    • [ ] QuickCheckout
    • [ ] SignUp
    • [ ] Wishlists
    • [ ] WishlistButton
    • [ ] PaymentMethodSelector
    • [ ] ShippingMethodSelector
    • [ ] AddressSelector
    • [ ] MyAccount
    • [ ] OrdersList
    • [ ] AddressForm
    • [ ] CurrencyPicker
    • [ ] CustomerProfile
    • [ ] AddressList
• [ ] Development
  • [ ] Working with Mall
    • [ ] Product Model
    • [ ] Variant Model
    • [ ] Order Model
    • [ ] Cart Model
    • [ ] Wishlist Model
    • [ ] Payment Providers
    • [ ] Pricing Information
    • [ ] Events
    • [ ] PDF
    • [ ] Integration
    • [ ] Artisan Console
  • [ ] Extending Mall
    • [ ] Work in Progress
    • [ ] Unit Testing
  • [x] Changelog