Fix webroot in home template

[ciis0]

When hosting CryptoTools yourself under non-root, things generally work fine, only the links on the start page are wrong.

This fixes that.

You also need to adjust the routers base-path: https://github.com/khicks/CryptoTools.net/blob/ff5c3a80fc0397f41dab8a25d572e1c936b84981/index.php#L7

for example to

 $router->setBasePath('/cryptotools');