Add Content section

We could add a **Content** section in order to store all the stuff related to **content, branding and marketing** (tone of voice, email signature, presentation templates, use of logos, ecc).

It could be also a great way to show interested clients a way to store, organize and present all the content stuff to their non-technical employees instead of having thousands of versioned pdf an ppt.

#### References
- https://polaris.shopify.com/content/product-content
- https://atlassian.design/guidelines/brand/personality
- https://www.carbondesignsystem.com/guidelines/content/general