Drop vue-aos

- not compatible with SSR
- the latest version propose to install component globally be default
- not compatible with Vue 3
- IntersectionObserver API looks like that it is more performant if it is created once

package.json

@@ -38,7 +38,6 @@
     "soundcloud-widget": "^0.2.1",
     "tipping-contract": "github:aeternity/tipping-contract#v3.1.0-alpha2",
     "vue": "^2.6.14",
-    "vue-aos": "^2.1.0",
     "vue-chartjs": "^3.5.1",
     "vue-i18n": "^8.24.5",
     "vue-meta": "^2.4.0",