Readability and functionality improvements

- Refactored all DBwork functions to not set and close connection inside
their body, they use connection as a parameter instead
- Added single file to configure a FastAPI app
- Implemented FastAPI's lifespan function that calls certain functions
on app startup and shutdown
- Added error logging for scraping functions
- Fixed /articles/get/html and /articles/get/md endpoints
- All POST methods now return base64 encoded html/md strings to avoid
weird json formatting

src/app_creator.py

@@ -0,0 +1,41 @@
+import config
+import router
+import DBwork
+from fastapi import FastAPI
+from loguru import logger
+from contextlib import asynccontextmanager
+
+
+if config.enable_api_docs:
+    docs_url = '/api/docs'
+else:
+    docs_url = None
+
+schema_name = 'harticle'
+table_name = 'articles'
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    DBwork.set_connection()
+    DBwork.schema_creator(schema_name, DBwork.connection)
+    DBwork.table_creator(schema_name, table_name, DBwork.connection)    
+    yield
+    DBwork.close_connection(DBwork.connection)
+
+
+app = FastAPI(docs_url=docs_url, lifespan=lifespan)
+
+
+def create_app():
+    logging_level = config.logging_level
+    logger.add(
+    "sys.stdout",
+    format="{time:YYYY-MM-DD HH:mm:ss.SSS} | {level} | {file}:{line} - {message}",
+    colorize=True,
+    level=logging_level
+    )
+    
+    app.include_router(router.router)
+
+    return app