Design work - Create an updated design for the EsNote component

[mansona]

As part of the Ember Octane upgrade PR to the styleguide the design of the EsNote component needs to be updated. #306

This update was a "first pass" and it will need an improved design that fits in with the overall look and feel of the guides redesign 👍

[jenweber]

Here's an example PR containing some past work: #306

[mansona]

Here are some proposals for the new design:

[mansona]

We discussed this in the learning team and we want to go with

although everyone said they liked the last one with the folded corner 😂

[MinThaMie]

@MinThaMie will build the one that sparks her and @mansona joy which is the one with the dog ear. It's fixed in #421