Use httpie.io/docs everywhere

[skip ci]

httpie/cli/argparser.py

@@ -311,7 +311,7 @@ class HTTPieArgumentParser(argparse.ArgumentParser):
             self.error('Request body (from stdin, --raw or a file) and request '
                        'data (key=value) cannot be mixed. Pass '
                        '--ignore-stdin to let key/value take priority. '
-                       'See https://httpie.org/doc#scripting for details.')
+                       'See https://httpie.io/docs#scripting for details.')
 
     def _guess_method(self):
         """Set `args.method` if not specified to either POST or GET

httpie/cli/definition.py

@@ -30,7 +30,7 @@ from ..ssl import AVAILABLE_SSL_VERSION_ARG_MAPPING, DEFAULT_SSL_CIPHERS
 
 parser = HTTPieArgumentParser(
     prog='http',
-    description=f'{__doc__.strip()} <https://httpie.org>',
+    description=f'{__doc__.strip()} <https://httpie.io>',
     epilog=dedent('''
     For every --OPTION there is also a --no-OPTION that reverts OPTION
     to its default value.
@@ -96,7 +96,7 @@ positional.add_argument(
 
     ':' HTTP headers:
 
-        Referer:http://httpie.org  Cookie:foo=bar  User-Agent:bacon/1.0
+        Referer:https://httpie.io  Cookie:foo=bar  User-Agent:bacon/1.0
 
     '==' URL parameters to be appended to the request URI:
 

httpie/sessions.py

@@ -52,7 +52,7 @@ def get_httpie_session(
 
 
 class Session(BaseConfigDict):
-    helpurl = 'https://httpie.org/doc#sessions'
+    helpurl = 'https://httpie.io/docs#sessions'
     about = 'HTTPie session file'
 
     def __init__(self, path: Union[str, Path]):