Extend the capabilities of the Quill text editor

ref: ED022

User story

As a participant I want to have more options for text editing in the frontend, being able to add links and apply predefined styles to texts.
As an admin I want to have more options for text editing in the backend, being able to add links and apply predefined styles to texts.

Current implementation (2 modes)

a) Toolbar

a) Toolbar + styles

Related issues

https://meta.decidim.org/processes/roadmap/f/219/debates/34
https://meta.decidim.org/processes/roadmap/f/122/proposals/12375
https://meta.decidim.org/processes/roadmap/f/122/proposals/12046
https://meta.decidim.org/processes/roadmap/f/122/proposals/14628

Tasks

• Add internal setting in the general configuration options, to configure if the editor is displayed on the frontend. Disabled by default.
• Add editor "toolbar" to the public view of components: proposals and debates
• Add editor "toolbar + styles" to the backend view of components: meetings, budgets, results and debates
• Review what actions require HTML code cleanup, e.g. when exporting proposals