chore(a11y): External link was read as a button

[OtavioStasiak]

Proposed changes

Currently, when using TalkBack or VoiceOver to navigate to the SettingsView, the screen reader identifies options that open an external link as buttons. This PR will fix this by updating the accessibilityRole to 'link.'

Issue(s)

https://rocketchat.atlassian.net/browse/MA-111

How to test or reproduce

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments