Refactor CMS to handle ContentLayer and WordPress platforms

This commit refactors the CMS to handle two platforms: ContentLayer and WordPress. The CMS layer is abstracted into a core package, and separate implementations for each platform are created. This change allows the app to switch the CMS type based on environment variable, which can improve the flexibility of content management. It also updates several functions in the `server-sitemap.xml` route to accommodate these changes and generate sitemaps based on the CMS client. Further, documentation content and posts have been relocated to align with the new structure. Notably, this refactor is a comprehensive update to the way the CMS is structured and managed.

apps/web/app/(marketing)/docs/_lib/build-documentation-tree.ts

@@ -1,55 +0,0 @@
-import { cache } from 'react';
-
-import type { DocumentationPage } from 'contentlayer/generated';
-
-export interface ProcessedDocumentationPage extends DocumentationPage {
-  collapsible: boolean;
-  pathSegments: string[];
-  nextPage: ProcessedDocumentationPage | DocumentationPage | undefined;
-  previousPage: ProcessedDocumentationPage | DocumentationPage | undefined;
-  children: DocsTree;
-}
-
-export type DocsTree = ProcessedDocumentationPage[];
-
-/**
- * Build a tree of documentation pages from a flat list of pages with path segments
- * @param docs
- * @param parentPathNames
- */
-export const buildDocumentationTree = cache(
-  (docs: DocumentationPage[], parentPathNames: string[] = []): DocsTree => {
-    const level = parentPathNames.length;
-
-    const pages = docs
-      .filter(
-        (_) =>
-          _.pathSegments.length === level + 1 &&
-          // eslint-disable-next-line @typescript-eslint/no-unsafe-call
-          _.pathSegments
-            .map(({ pathName }: { pathName: string }) => pathName)
-            .join('/')
-            .startsWith(parentPathNames.join('/')),
-      )
-      .sort(
-        (a, b) => a.pathSegments[level].order - b.pathSegments[level].order,
-      );
-
-    return pages.map((doc, index) => {
-      const children = buildDocumentationTree(
-        docs,
-        // eslint-disable-next-line @typescript-eslint/no-unsafe-call
-        doc.pathSegments.map(({ pathName }: { pathName: string }) => pathName),
-      );
-
-      return {
-        ...doc,
-        pathSegments: doc.pathSegments || ([] as string[]),
-        collapsible: children.length > 0,
-        nextPage: children[0] ?? pages[index + 1],
-        previousPage: pages[index - 1],
-        children,
-      };
-    });
-  },
-);

apps/web/app/(marketing)/docs/_lib/get-documentation-page-tree.ts

@@ -1,45 +0,0 @@
-import { cache } from 'react';
-
-import type { DocumentationPage } from 'contentlayer/generated';
-import { allDocumentationPages } from 'contentlayer/generated';
-
-import { buildDocumentationTree } from './build-documentation-tree';
-
-/**
- * Retrieves a specific documentation page from the page tree by its path.
- *
- * @param {string} pagePath - The path of the documentation page to retrieve.
- * @returns {DocumentationPageWithChildren | undefined} The documentation page found in the tree, if any.
- */
-export const getDocumentationPageTree = cache((pagePath: string) => {
-  const tree = buildDocumentationTree(allDocumentationPages);
-
-  type DocumentationPageWithChildren = DocumentationPage & {
-    previousPage?: DocumentationPage | null;
-    nextPage?: DocumentationPage | null;
-    children?: DocumentationPage[];
-  };
-
-  const findPageInTree = (
-    pages: DocumentationPageWithChildren[],
-    path: string,
-  ): DocumentationPageWithChildren | undefined => {
-    for (const page of pages) {
-      if (page.resolvedPath === path) {
-        return page;
-      }
-
-      const hasChildren = page.children && page.children.length > 0;
-
-      if (hasChildren) {
-        const foundPage = findPageInTree(page.children ?? [], path);
-
-        if (foundPage) {
-          return foundPage;
-        }
-      }
-    }
-  };
-
-  return findPageInTree(tree, pagePath);
-});