fix: update URLs to use the "www" subdomain across the application

This commit modifies various metadata and canonical URLs in the SurfSense application to ensure consistency by using "https://www.surfsense.com" instead of "https://surfsense.com". Changes were made in layout files, blog posts, and SEO components to reflect this update.

surfsense_web/lib/blog-faq.ts

@@ -0,0 +1,54 @@
+import { promises as fs } from "node:fs";
+import path from "node:path";
+
+export interface FaqEntry {
+	question: string;
+	answer: string;
+}
+
+/**
+ * Extracts FAQ items from a blog post MDX file by parsing the `## FAQ` section.
+ *
+ * The FAQ section is bounded by `## FAQ` and the next H2 heading. Each H3 inside
+ * is treated as a question, with the body until the next H3 (or the end of the
+ * FAQ section) as its answer. Common Markdown decorations (links, bold, inline
+ * code) are stripped so the JSON-LD output contains plain text suitable for
+ * Google's FAQ rich-result eligibility checks.
+ *
+ * Returns an empty array when the post has no FAQ section, or when the file
+ * cannot be read (e.g. for posts that do not yet exist on disk).
+ */
+export async function extractFaqFromBlogPost(slug: string): Promise<FaqEntry[]> {
+	try {
+		const filepath = path.join(process.cwd(), "blog", "content", `${slug}.mdx`);
+		const content = await fs.readFile(filepath, "utf-8");
+		return extractFaqFromContent(content);
+	} catch {
+		return [];
+	}
+}
+
+export function extractFaqFromContent(content: string): FaqEntry[] {
+	const faqHeading = content.match(/^##\s+FAQ\s*$/m);
+	if (!faqHeading || faqHeading.index === undefined) return [];
+
+	const afterFaq = content.slice(faqHeading.index + faqHeading[0].length);
+	const nextH2 = afterFaq.match(/^##\s+/m);
+	const faqBody = nextH2 ? afterFaq.slice(0, nextH2.index) : afterFaq;
+
+	const blocks = faqBody.split(/^###\s+/m).slice(1);
+
+	return blocks
+		.map((block) => {
+			const newlineIdx = block.indexOf("\n");
+			const question = (newlineIdx === -1 ? block : block.slice(0, newlineIdx)).trim();
+			const answer = (newlineIdx === -1 ? "" : block.slice(newlineIdx + 1))
+				.trim()
+				.replace(/\[([^\]]+)\]\([^)]+\)/g, "$1")
+				.replace(/\*\*([^*]+)\*\*/g, "$1")
+				.replace(/`([^`]+)`/g, "$1")
+				.replace(/\s+/g, " ");
+			return { question, answer };
+		})
+		.filter((item) => item.question.length > 0 && item.answer.length > 0);
+}