DDS-1905: Correct outdated information in Technical Overview

[aishling-scilifelab]

• Correct outdated info about S3 keys
• Add line about extending the deadline for a project

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.49%. Comparing base (abccb24) to head (b908a08).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1540   +/-   ##
=======================================
  Coverage   92.49%   92.49%           
=======================================
  Files          29       29           
  Lines        4850     4850           
=======================================
  Hits         4486     4486           
  Misses        364      364           

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