Docs: Add Goose Recipes Cookbook Page (#2998)

.github/ISSUE_TEMPLATE/reply-to-recipe.yml

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+name: Auto-reply to Recipe Submissions
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  thank-you-comment:
+    if: contains(github.event.issue.title, '[Recipe]')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Add thank-you comment
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const commentBody = [
+              "🎉 Thanks for submitting your Goose recipe to the Cookbook!",
+              "",
+              "We appreciate you sharing your workflow with the community — our team will review your submission soon.",
+              "If accepted, it’ll be added to the [Goose Recipes Cookbook](https://block.github.io/goose/recipes) and you’ll receive LLM credits as a thank-you!",
+              "",
+              "Stay tuned — and keep those recipes coming 🧑‍🍳🔥"
+            ].join('\n');
+
+            github.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: commentBody
+            });

.github/ISSUE_TEMPLATE/submit-recipe.yml

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+name: 🧑‍🍳 Submit a Recipe to the Goose Cookbook
+description: Share a reusable Goose session (aka a recipe) to help the community!
+title: "[Recipe] <your recipe title here>"
+labels: ["recipe submission"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for contributing to the Goose Cookbook! 🍳  
+        Recipes are reusable sessions created in Goose Desktop or CLI and shared with the community to help others vibe-code faster.
+
+        📌 **How to Submit**
+        - Create your recipe using Goose (“Make Agent from this session”)
+        - Fill out the JSON below using the format provided
+        - Paste it into the field and submit the issue — we’ll review and add it to the Cookbook!
+
+        🪄 **What Happens After?**
+        - If accepted, we’ll publish your recipe to the [Goose Recipes Cookbook](https://block.github.io/goose/recipes)
+        - You’ll receive LLM credits as a thank-you!
+        - Your GitHub handle will be displayed and linked on the recipe card
+
+  - type: textarea
+    id: recipe-json
+    attributes:
+      label: Paste Your Recipe JSON Below
+      description: Use the structure below and be sure to include your GitHub handle.
+      placeholder: |
+        {
+          "id": "pr-generator",
+          "title": "PR Generator",
+          "description": "Generate pull request descriptions based on staged changes and git history.",
+          "action": "Generate PR",
+          "category": "Developer",
+          "extensions": ["GitHub MCP", "Memory"],
+          "activities": ["Summarize changes", "Create PR branch", "Push PR"],
+          "recipeUrl": "https://goose.block.xyz/recipe/pr-generator",
+          "author": "your-github-handle"
+        }
+    validations:
+      required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        🛠 **Recipe Field Tips**
+        - `"id"` should be lowercase, hyphenated, and unique (e.g. `my-awesome-recipe`)
+        - `"action"` describes the core purpose of the recipe (e.g., `Generate Docs`)
+        - `"category"` is the type of user this recipe is for (e.g., `Developer`, `Entertainment`)
+        - `"extensions"` are the Goose tools this recipe uses
+        - `"recipeUrl"` is from Goose Desktop/CLI
+        - `"author"` is your GitHub handle — we’ll link to your profile in the Cookbook