Add a proper interface for the alpha release

[matuella]

As it stands today, the tool is functional but lack a lot on the user experience, as it was made to simply fill an internal problem to deal with collection-generation within the memo project.

We need to make sure that memo_editor also fits the same quality that memo brings to their users, as we eventually plan to release an alpha version that anyone can use to customize its collections and memos, suggest additions to the core memo repository, etcetera.

This also involves adding a bunch of other functionalities that are missing today, like validating the collection properties text fields, responsive layout (with experience-adjusted features for each "major" device size), connecting the existing collections in the memo repository and "bridge" the changes-suggestion in the core repository (using this editor tool), and a lot of other things.

This also brings us one important question (that we are currently evaluating): should we actually merge this editor into the main tool (/memo repository) and diminish the difficulty for new entrants to join the memo ecosystem and start contributing?