Allow registered diagrams to be overridden.

Co-authored-by: Alois Klink <[email protected]>

…into sidv/splitELK

* 'sidv/splitELK' of https://github.com/mermaid-js/mermaid:
  5043 Allow registered diagrams to be overridden.

* next: (39 commits)
  reset the testTimeout to 5 seconds and change it directly in the test
  update testTimeout from 5 seconds to 10 seconds
  Update all patch dependencies
  fix broken link
  add latest blog post
  Update all minor dependencies
  fix linting
  fix: set proper shiki theme for light and dark modes
  fix: change shiki theme to github-light
  add latest blog post
  GitGraph: made reroute fn more readable
  GitGraph: simplified branch check in arrow rerouting fn
  GitGraph: added commit IDs to e2e test to remove false positives
  GitGraph: Moved branch curve check to within reroute check fn
  GitGraph: corrected minor typo in comment.
  GitGraph: added 2x e2e tests for branches not used immediately
  GitGraph: added branch checking to rerouting
  GitGraph: Added e2e tests for deferred branch use.
  GitGraph: e2e tests, added commit IDs to test graphs
  GitGraph: fixed an e2e branch for vertical branch
  ...