Update backends and ecosystem diagrams in the docs

[MatteoRobbiati]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (45e4e22) 99.96% compared to head (ed3d652) 99.96%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1201   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          70       70           
  Lines       10414    10414           
=======================================
  Hits        10410    10410           
  Misses          4        4           

Flag	Coverage Δ
unittests	99.96% <ø> (ø)

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[renatomello]

Quantum Information is not aligned with its box

[MatteoRobbiati]

Quantum Information is not aligned with its box

You mean it is not centred?

[renatomello]

Quantum Information is not aligned with its box

You mean it is not centred?

Information is out of the box, it doesn't fit

[MatteoRobbiati]

Quantum Information is not aligned with its box

You mean it is not centred?

Information is out of the box, it doesn't fit

Could you please check now? It was a problem only in some browsers and I didn't noticed before your comment. Now in my Firefox is fixed.