Remove ui's landing page and its dependencies

[acuarica]

The landing page of Sourcify https://sourcify.dev/ is part of the ui react app. However, instead of a landing page, Hedera verification uses the verifier page directly.

To avoid polluting the react app with unused pages and to make the ui leaner, remove the landing page and it's dependencies.

Tasks

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1. Remove ui/src/pages/LandingPage
2. Review and remove any dangling file pointed by LandingPage/*
3. Review and remove dangling package.json's dependencies
4. Review and remove and dangling assets