♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

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Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/tsconfigs/base.json

@@ -1,33 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "compilerOptions": {
-    // Enable top-level await, and other modern ESM features.
-    "target": "ESNext",
-    "module": "ESNext",
-    // Enable module resolution without file extensions on relative paths, for things like npm package imports.
-    "moduleResolution": "Bundler",
-    // Allow importing TypeScript files using their native extension (.ts(x)).
-    "allowImportingTsExtensions": true,
-    // Enable JSON imports.
-    "resolveJsonModule": true,
-    // Enforce the usage of type-only imports when needed, which helps avoiding bundling issues.
-    "verbatimModuleSyntax": true,
-    // Ensure that each file can be transpiled without relying on other imports.
-    // This is redundant with the previous option, however it ensures that it's on even if someone disable `verbatimModuleSyntax`
-    "isolatedModules": true,
-    // Astro directly run TypeScript code, no transpilation needed.
-    "noEmit": true,
-    // Report an error when importing a file using a casing different from another import of the same file.
-    "forceConsistentCasingInFileNames": true,
-    // Properly support importing CJS modules in ESM
-    "esModuleInterop": true,
-    // Skip typechecking libraries and .d.ts files
-    "skipLibCheck": true,
-    // Allow JavaScript files to be imported
-    "allowJs": true,
-    // Allow JSX files (or files that are internally considered JSX, like Astro files) to be imported inside `.js` and `.ts` files.
-    "jsx": "preserve"
-  },
-  "exclude": ["${configDir}/dist"],
-  "include": ["${configDir}/.astro/types.d.ts", "${configDir}/**/*"]
-}

dealplustech-astro/node_modules/astro/tsconfigs/strict.json

@@ -1,8 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "extends": "./base.json",
-  "compilerOptions": {
-    // Enable strict mode. This enables a few options at a time, see https://www.typescriptlang.org/tsconfig#strict for a list.
-    "strict": true
-  }
-}

dealplustech-astro/node_modules/astro/tsconfigs/strictest.json

@@ -1,24 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "extends": "./strict.json",
-  "compilerOptions": {
-    // Report errors for fallthrough cases in switch statements
-    "noFallthroughCasesInSwitch": true,
-    // Force functions designed to override their parent class to be specified as `override`.
-    "noImplicitOverride": true,
-    // Force functions to specify that they can return `undefined` if a possible code path does not return a value.
-    "noImplicitReturns": true,
-    // Report an error when a variable is declared but never used.
-    "noUnusedLocals": true,
-    // Report an error when a parameter is declared but never used.
-    "noUnusedParameters": true,
-    // Force the usage of the indexed syntax to access fields declared using an index signature.
-    "noUncheckedIndexedAccess": true,
-    // Report an error when the value `undefined` is given to an optional property that doesn't specify `undefined` as a valid value.
-    "exactOptionalPropertyTypes": true,
-    // Report an error for unreachable code instead of just a warning.
-    "allowUnreachableCode": false,
-    // Report an error for unused labels instead of just a warning.
-    "allowUnusedLabels": false
-  }
-}