Tweak the Token UI copy on the repo onboarding section

[Adal3n3]

Problem to solve

Description

The problem is the repo token instruction is designed only for GH's users, so users from Bitbucket, GitLab, CircleCI will get confuse on the wording.

As a Bitbucket user, am completely offended that you tell me to add the Codecov token as a GitHub repo secret! -Joe

Steps to Reproduce / Current UX

Explore options:

1. should we provide BB/CircleCI setup option?
2. Maybe have one more setup option to decouple from GH action.

ToDo: Understand how do they onboard today - check documentation.

Possible solution

Action Checklist for Issue Creation

• Add the design project (to the right under "projects" > settings icon > select "design team")
• Share in relevant Slack channel (#discuss-codecov-product-design) for visiblity
• Add targeted launch date/delivery date as/if needed

Additional Information