fix(frontend): update branding

frontend/.eslintrc.json

frontend/components/Center.tsx

frontend/components/Footer.module.scss

frontend/components/Footer.tsx

frontend/components/Navbar.tsx

frontend/package.json

frontend/pages/index.tsx

frontend/pages/privacy-policy.tsx

frontend/public/images/ai4eosc-white-no-bg.svg

frontend/public/images/back.png

frontend/public/images/deephdc-logo.png

frontend/public/images/eosc-white-no-bg.svg

frontend/public/images/logo-imagine-horizontal-white.png

frontend/public/images/network.png

frontend/styles/custom.css

frontend/yarn.lock

package.json

yarn.lock