Add Formyfi DApp to showcase

[TDarkDev]

Thank you for your contribution to the IC Developer Portal. Before submitting your Pull Request, please make sure that:

• [x] You have updated the .github/CODEOWNERS file according to your changes.
• [x] You have registered new documents to /sidebars.js if any.

[sa-github-api]

Dear @TDarkDev,

In order to potentially merge your code in this open-source repository and therefore proceed with your contribution, we need to have your approval on DFINITY's CLA.

If you decide to agree with it, please visit this issue and read the instructions there. Once you have signed it, re-trigger the workflow on this PR to see if your code can be merged.

— The DFINITY Foundation

[jennifertrin]

Thank you for your contribution to the IC Developer Portal. Before submitting your Pull Request, please make sure that:

• [x] You have updated the .github/CODEOWNERS file according to your changes.
• [x] You have registered new documents to /sidebars.js if any.

@TDarkDev Can you please compress the logo file size? We have a restriction of 200 MB for the logo file size.

[jennifertrin]

@TDarkDev, we will add this on the ecosystem page in our own PR with the adjusted image size. Thank you.