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
- [x] Remove `ui/src/pages/LandingPage`
- [x] Review and remove any dangling file pointed by `LandingPage/*`
- [x] Review and remove dangling `package.json`'s dependencies
- [x] Review and remove and dangling assets
The landing page of Sourcify https://sourcify.dev/ is part of the
uireact 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
uileaner, remove the landing page and it's dependencies.