fix: webcatalog.yml url, description and screenshots

[quanglam2807]

• update url from outdated link to https://getwebcatalog.com.
• update description to match the current one.
• update screenshots, as shown on https://getwebcatalog.com.

[ci-reporter]

The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Travis CI build is failing as of 5a5ee96. Here's the output:

npm test

> electron-apps@1.7398.0 test /home/travis/build/electron/apps
> mocha --reporter min test/human-data.js test/colors-spec.js && standard --fix


/home/travis/build/electron/apps/node_modules/yamljs/lib/Parser.js:347
        throw new ParseException('Indentation problem.', this.getRealCurrentLineNb() + 1, this.currentLine);
        ^
Error: Indentation problem.

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

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[ckerr]

LGTM. Thanks for the update!