feat: introduction screen

[pedroafmonteiro]

Closes #1511

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60%. Comparing base (a2a09c6) to head (f50a756).
⚠️ Report is 1 commits behind head on develop.

❌ Your project check has failed because the head coverage (60%) is below the target coverage (70%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1655   +/-   ##
=======================================
  Coverage       60%     60%           
=======================================
  Files            2       2           
  Lines           81      81           
=======================================
  Hits            48      48           
  Misses          33      33           

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