adsher.es gives 403 forbidden on documentation link

[bneijt]

Describe the bug

https://github.com/adshares/adserver/wiki/How-to-use-Advertising-Ecosystem-Demo

points to https://adshar.es/ which returns 403 forbidden.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://github.com/adshares/adserver/wiki/How-to-use-Advertising-Ecosystem-Demo
2. Click on the demo website link
3. See error

Expected behavior

An accessible demo website.