docs(readme): fixup typos in Readme files

[Slashgear]

Why

Found out they were still some small issues in scaleway lib documentation files

How

• remove duplicated title in global readme file
• rename heading1 of cookie-consent package to remove reference of shire

[changeset-bot]

🦋 Changeset detected

Latest commit: d552203

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@scaleway/cookie-consent	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (73a01d1) 98.49% compared to head (81ee9c5) 98.49%.

❗ Current head 81ee9c5 differs from pull request most recent head d552203. Consider uploading reports for the commit d552203 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1602   +/-   ##
=======================================
  Coverage   98.49%   98.49%           
=======================================
  Files          30       30           
  Lines         797      797           
  Branches      115      115           
=======================================
  Hits          785      785           
  Misses          2        2           
  Partials       10       10           

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