**Motivation**

Currently we have different email styles. I want to have the look and feel for all emails sent by Begin of the insertionOpenProject.End of the insertion Begin of the deletion OpenProject. End of the deletion

Example of an unstyled email:

<figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/22741/content"></div></figure>

**Acceptance criteria:**

* All emails use the same styles.
* The custom styles are applied to the emails
* Link font
* Primary

**Email notifications:**

* [ ] @mention in work package
* [ ] email reminder
* [ ] forgot passwod
* [ ] test email
* [ ] news added
* [ ] comment on a news item
* [ ] documents added
* [ ] wiki page added
* [ ] wiki page updated
* [ ] membership added
* [ ] membership updated
* [ ] user created/invited
* [ ] .....