feat: add aurweb-config console script

This can be used to update config values for the entirety
of a config. When config values are set through this tool,
$AUR_CONFIG is overridden with a copy of the config file
with all sections and options found in $AUR_CONFIG
+ $AUR_CONFIG_DEFAULTS.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/config.py

@@ -1,6 +1,8 @@
 import configparser
 import os
 
+from typing import Any
+
 # Publicly visible version of aurweb. This is used to display
 # aurweb versioning in the footer and must be maintained.
 # Todo: Make this dynamic/automated.
@@ -52,3 +54,13 @@ def getint(section, option, fallback=None):
 def get_section(section):
     if section in _get_parser().sections():
         return _get_parser()[section]
+
+
+def replace_key(section: str, option: str, value: Any) -> Any:
+    _get_parser().set(section, option, value)
+
+
+def save() -> None:
+    aur_config = os.environ.get("AUR_CONFIG", "/etc/aurweb/config")
+    with open(aur_config, "w") as fp:
+        _get_parser().write(fp)