Add Coventry University Wayfinder to the list

[richardcov]

I'd have made a pull request except I'm not sure how you'd categorise this site. Also, the repo is not public - does that matter?

[Coventry University Wayfinder](https://wayfinder.coventry.ac.uk/?location=coventry-university) - PWA built on Vuepress and Vuetify.

[ulivz]

Feel free to submit a pull request