[openwebanalytics] fix and improve guide

[noave]

installation

• use php 8.1 if works
• install in root or in subdomain if its necessary to use together with a website on same uberspace, but not in subfolder
• tell explicit to check for the latest version and replace it in url
• create DB in extra step
• better use https://github.com/Open-Web-Analytics/Open-Web-Analytics/wiki/Installing-from-Github using release tags:

git clone --depth 1 --branch 1.7.7 https://github.com/Open-Web-Analytics/Open-Web-Analytics owa
composer install --no-dev --optimize-autoloader --prefer-dist --no-interaction

but it fails for me at npm run build need to be checked again

configuration

• configure not using web installer but config file owa-config.php

updates

• need to be adapted to git installation routine

[noave]

so far the guide does not work because there it looks like the web installer does not create the tables, so I will mark it as temporary broken