add time ago on recent items

+ move to waitress wsgi server
+ refactor dates utils
+ create locustfile for stress test

pyproject.toml

@@ -10,7 +10,6 @@ Flask = "^2.0.2"
 Flask-Cors = "^3.0.10"
 requests = "^2.27.1"
 watchdog = "^3.0.0"
-gunicorn = "^20.1.0"
 Pillow = "^9.0.1"
 "colorgram.py" = "^1.2.0"
 tqdm = "^4.65.0"
@@ -24,6 +23,8 @@ flask-compress = "^1.13"
 tabulate = "^0.9.0"
 setproctitle = "^1.3.2"
 flask-restful = "^0.3.10"
+locust = "^2.20.1"
+waitress = "^2.1.2"
 
 [tool.poetry.dev-dependencies]
 pylint = "^2.15.5"