[riddle_quiz_maker] Update app metadata: description, logo and MCP URL

Hi Pipedream team 👋

I'm from the team at [Riddle](https://www.riddle.com/) (the app is listed as Riddle Quiz Maker, slug riddle_quiz_maker). Our listing is out of date in three ways. Happy to provide anything else you need.

**Description: Riddle is more than surveys and forms**

The current description only mentions surveys/forms, which covers a small part of what the platform does. Riddle is an interactive content platform with 35+ content types.

Suggested description:

Riddle is an interactive content platform for quizzes, personality tests, polls and surveys, forms, predictors, leaderboards, minigames and stories. Build, publish and embed interactive content, then collect and route the results — no code required.

If you prefer a shorter version:

Build and embed interactive content — quizzes, personality tests, polls, surveys, forms, predictors, leaderboards, minigames and stories — and collect the results.

The formats, as we name them on our site:
- Quiz
- Personality test / personality quiz
- Poll & survey
- Form
- Predictor
- Leaderboard
- Minigame
- Story

**Logo: please use our current logo**
The logo on the listing is an older version. Current brand assets:

SVG (color): https://cdn.riddle.com/website/assets-2023/logos/svg/logo.svg
SVG (white / for dark backgrounds): https://cdn.riddle.com/website/assets-2023/logos/svg/logo-white.svg
PNG (color): https://cdn.riddle.com/website/assets-2023/logos/png/large/logo-large.png
PNG (white): https://cdn.riddle.com/website/assets-2023/logos/png/large/logo-white-large.png

If you need a square icon-only version at a specific size for the app tile, let me know the spec and I'll attach it here.

**MCP URL**

Please point to our official MCP resources:

Documentation: https://www.riddle.com/help/api/mcp
MCP server endpoint: https://www.riddle.com/creator/api/v3/mcp

The endpoint supports account linking via CIMD (preferred) and an MCP-key variant (https://www.riddle.com/creator/api/v3/mcp/), with keys generated on the API keys page in a Riddle account.

Locate the app listing metadata for the riddle_quiz_maker slug and compare its current description, logo, and MCP information with the values and asset URLs in the issue. Update all three items, then verify that the listing uses the new description, current logo, and https://www.riddle.com/creator/api/v3/mcp endpoint.

Written by the indexing model from the issue text.