rewrite the project as a static site generator

this removes Flask, reworks a number of library methods accordingly, and
adds generators and build commands to process the instance directory
(largely unchanged, except config.py is now config.json) and spit out
files suitable to be served by a web server such as Nginx.

there are probably some rough edges here, but overall this works.

also note, as this is no longer server software on a network, the
license has changed from AGPLv3 to GPLv3, and the "or any later version"
allowance has been removed

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

incorporealcms/config.py

@@ -1,7 +1,7 @@
 """Default configuration.
 
 SPDX-FileCopyrightText: © 2020 Brian S. Stephan <bss@incorporeal.org>
-SPDX-License-Identifier: AGPL-3.0-or-later
+SPDX-License-Identifier: GPL-3.0-only
 """
 
 
@@ -51,8 +51,6 @@ class Config(object):
         },
     }
 
-    MEDIA_DIR = 'media'
-
     # customizations
     PAGE_STYLES = {
         'dark': '/static/css/dark.css',
@@ -61,11 +59,18 @@ class Config(object):
     }
 
     DEFAULT_PAGE_STYLE = 'light'
-    DOMAIN_NAME = 'example.com'
+    DOMAIN_NAME = 'example.org'
     TITLE_SUFFIX = DOMAIN_NAME
-    CONTACT_EMAIL = 'admin@example.com'
+    BASE_HOST = 'http://' + DOMAIN_NAME
+    CONTACT_EMAIL = 'admin@example.org'
 
     # feed settings
-    AUTHOR = {'name': 'Test Name', 'email': 'admin@example.com'}
+    AUTHOR = {'name': 'Test Name', 'email': 'admin@example.org'}
 
-    # specify FAVICON in your instance config.py to override the provided icon
+    FAVICON = '/static/img/favicon.png'
+
+    @classmethod
+    def update(cls, config: dict):
+        """Update this configuration with a dictionary of values from elsewhere."""
+        for key, value in config.items():
+            setattr(cls, key, value)