Update index.md

[baggepinnen]

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[JuliaControlBot]

This is an automated message.
Plots were compared to references. 11/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
❌ 0.031
⚠️ 0.025
✔️ 0.008
⚠️ 0.019
⚠️ 0.024
⚠️ 0.025
⚠️ 0.017
⚠️ 0.023
❌ 0.032
✔️ 0.006
✔️ 0.01

[codecov]

Codecov Report

Merging #466 (db28b6a) into master (484b00f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #466   +/-   ##
=======================================
  Coverage   85.20%   85.20%           
=======================================
  Files          31       31           
  Lines        3102     3102           
=======================================
  Hits         2643     2643           
  Misses        459      459           

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