feat(morpho): listing the dapp and explainer

[tomrpl]

Description

1. Added the Morpho App with the right logo (verify-able at brand.morpho.org)
   following the examples of other protocols.

2. Added a short explainer in the DeFI Landscape

Related Issue

as per this issue: #13937

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[tomrpl]

One question remaining: should I use a tool to translate into other languages than "en", or should I leave the floor to the translator community?

Thanks a lot