client: improved build.js, use relative links

* Removed unnecessary require('config.js') calls
* 'markdown.js' now uses rel. links in EntityPermalinkWrapper
* 'password_reset.py' now generates rel. links
* Removed 'Base URL' config parameter
* Removed 'API URL' config parameter
* 'build.js' no longer reads/requires config.yaml
* Updated documentation
* Removed unnecessary node packages used in 'build.js'

abandon api_url parameter

server/szurubooru/api/password_reset_api.py

@@ -21,8 +21,7 @@ def start_password_reset(
             'User %r hasn\'t supplied email. Cannot reset password.' % (
                 user_name))
     token = auth.generate_authentication_token(user)
-    url = '%s/password-reset/%s:%s' % (
-        config.config['base_url'].rstrip('/'), user.name, token)
+    url = '/password-reset/%s:%s' % (user.name, token)
     mailer.send_mail(
         'noreply@%s' % config.config['name'],
         user.email,

server/szurubooru/facade.py

@@ -79,7 +79,7 @@ def validate_config() -> None:
             'Default rank %r is not on the list of known ranks' % (
                 config.config['default_rank']))
 
-    for key in ['base_url', 'api_url', 'data_url', 'data_dir']:
+    for key in ['data_url', 'data_dir']:
         if not config.config[key]:
             raise errors.ConfigError(
                 'Service is not configured: %r is missing' % key)