docs: Add Doc Collections step to quickstart guide

fern/docs/getting-started.mdx

@@ -8,10 +8,11 @@ Promptless automatically updates your docs, saving your team time and improving
 
 ## Quick Setup Overview
 
-Get Promptless running in 2 simple steps:
+Get Promptless running in 3 simple steps:
 
 1. **Set up integrations** - Set up integrations for triggers, context sources, and documentation platforms
-2. **Create a project** - Configure how and when Promptless should update your docs
+2. **Create a doc collection** - Tell Promptless where your documentation lives
+3. **Create a project** - Configure how and when Promptless should update your docs
 
 ## Step 1: Set up integrations
 
@@ -33,7 +34,29 @@ Visit the [Integrations page](https://app.gopromptless.ai/integrations) in your
   <img src="./assets/integrations-page.png" alt="Integrations Page" />
 </Frame>
 
-## Step 2: Create a project
+## Step 2: Create a doc collection
+
+Visit the [Doc Collections page](https://app.gopromptless.ai/doc-collections) and tell Promptless where your documentation lives.
+
+<Frame>
+  <img src="https://promptless-customer-doc-assets.s3.amazonaws.com/docs-images/org_2lvkgU9erOFxYhtEVVC0ymPrPdF/doc-collections-page-ed0ad5a2.png" alt="Doc Collections Page" />
+</Frame>
+
+Click **+ New Doc Collection** and configure:
+
+- **Platform**: Your documentation provider (GitHub, Zendesk, Intercom, Webflow, etc.)
+- **Repository/Location**: Where your docs are hosted
+- **Branch**: Default branch for documentation updates
+- **Include Directories**: Which directories contain your documentation
+- **Config File**: Path to your config file (for platforms like Fern, Docusaurus, etc.)
+
+<Frame>
+  <img src="https://promptless-customer-doc-assets.s3.amazonaws.com/docs-images/org_2lvkgU9erOFxYhtEVVC0ymPrPdF/new-doc-collection-modal-742f13f6.png" alt="New Doc Collection Modal" />
+</Frame>
+
+Promptless will analyze and index your docs—this typically takes 5-30 minutes.
+
+## Step 3: Create a project
 
 Visit the [Projects page](https://app.gopromptless.ai/projects) to create your first project.
 
@@ -56,6 +79,10 @@ Need both trigger types? Create separate projects with identical settings for ea
 
 ### Project Configuration Options
 
+<ParamField path="Doc Collection" type="required">
+  Select from your existing doc collections to specify where Promptless should publish documentation updates
+</ParamField>
+
 <ParamField path="Context Sources" type="optional">
   Select which Linear teams, Jira projects, or other sources to search for context
 </ParamField>
@@ -83,9 +110,7 @@ Create a dedicated Slack channel for documentation update notifications and conf
 
 ## What's Next?
 
-After creating a project, Promptless will start ingesting and indexing your documentation. This process helps Promptless learn your documentation structure and content, and remember it for future suggestions. This can take 5-30 minutes, depending on the size of your docs.
-
-Once setup is complete, Promptless will:
+Once your doc collection analysis is complete and you've created a project, Promptless will:
 - Listen for trigger events from your configured sources
 - Analyze changes and gather relevant context
 - Generate documentation suggestions for your review