documentation seems outdated and broken

[Ampholyt]

The documentation (https://opencobra.github.io/cobratoolbox/stable/index.html) seems outdated (e.g. installation instructions do not mention the newest version of MATLAB) and also broken (e.g. the icons are not displayed properly or the links to the tutorials are linking to nothing).

I hope it is correct to open an issue for this? I got confused because I found no issue related to this circumstance

Thank you in advance I hereby confirm that I have:

• [X] Tried to solve the issue on my own
• [X] Retried to run my code with the latest version of The COBRA Toolbox
• [X] Checked that a similar issue has not already been opened

(Note: You may replace [ ] with [X] to check the box)