After installation, the contributor I wanted to follow initialy is displayed as first

**Describe the feature/improvement**
Needs reflexion about the precise stage DisMoi shows the starting contributor

**Target user**
Users who discover and install Dismoi through profile pages

**User stories**
How will the user experience this feature/improvement?
1. The user can discover a contributor, for example Droit de réponse
2. He installs DisMoi
3. At subscribing stage, initial contributor is easy to reach
4. Easy to explore

**Additional context**
Related to previous improvment https://github.com/dis-moi/extension/issues/1005

Start by reviewing the related improvement in issue #1005 and tracing the installation and subscribing flow described here. Define the precise stage where the originally discovered contributor should be shown, then verify that users can reach and explore that contributor after installing DisMoi.

Written by the indexing model from the issue text.