docs: startAt for Link Surveys (#2317)

apps/formbricks-com/app/docs/link-surveys/start-at-question/page.mdx

@@ -0,0 +1,43 @@
+export const metadata = {
+  title: "Start At Specific Question",
+  description: "Start a survey at a specific question using the URL to skip the initial questions.",
+};
+
+#### Link Surveys
+
+# Start At Specific Question
+
+You can start a survey at a specific question from the survey using the URL to skip the initial questions. This is useful when you want to link to a specific question from an external source or want to use the same survey in different parts of the user journey.
+
+## How to Use it?
+
+1. In the Survey Editor, open the Questions Tab and ensure the survey is set as a **Link Survey**.
+
+2. Find the question you want to start at, click on **Show Advanced Settings**, and copy the **Question ID**.
+
+<Note>
+  Each question has a unique Question ID, which is used to identify it in the survey. You can use different
+  Question IDs for multiple **startAt** points in the URL.
+</Note>
+
+3. Append `?startAt=question_id` to your survey's URL, replacing `question_id` with the copied Question ID.
+
+4. Share this modified URL with your users to start the survey at the specified question.
+
+### Sample Link Survey URL with `startAt`
+
+<Col>
+<CodeGroup title="Example Link Survey URL with startAt configured">
+
+```sh
+https://formbricks.com/clny997dj087ho30fdzyf4nkl?startAt=bqd29m94l9k0hnc3azbrexl8
+```
+
+</CodeGroup>
+</Col>
+
+## Use Cases
+
+- **Link to a specific question from an external source:** Use this feature to direct users to a specific question in your survey from emails, chatbots, or web pages, providing a seamless experience.
+- **Use the same survey in different parts of the user journey:** Employ the same survey at various stages of the user journey, starting at different questions to gather comprehensive insights.
+- **Create a personalized survey experience:** Tailor the survey experience by starting at a particular question based on the user's past interactions or preferences, enhancing engagement.

apps/formbricks-com/components/docs/Navigation.tsx

@@ -209,6 +209,7 @@ export const navigation: Array<NavGroup> = [
       { title: "Single Use Links", href: "/docs/link-surveys/single-use-links" },
       { title: "Source Tracking", href: "/docs/link-surveys/source-tracking" },
       { title: "Hidden Fields", href: "/docs/link-surveys/hidden-fields" },
+      { title: "Start At Question", href: "/docs/link-surveys/start-at-question" },
     ],
   },
   {