Update vue and dependencies

[sGerli]

Currently the project is running on an old version of Vue, we should update it to the latest.
This would involve updating at least:

• vue 2.6.11 (latest stable) and its dependencies
• vue-instantsearch 3.2.0 (aka algolia)
• bootstrap-vue 2.17.0
• vue-dragscroll 2.1.0
• build scripts compatible with updated versions (currently using Webpack, but may change if necessary)

Some of those also have other dependencies that need to be updated.