ignore index.html and rss.xml from commits

These files change in ways that don't need to be
kept track of when testing

.gitignore

@@ -1,3 +1,5 @@
 img/
 __pycache__/
 .secrets
+index.html
+rss.xml

rss_update.py

@@ -1,10 +1,11 @@
 from random import randint
 import datetime
 
-# might as well use the datetime we made in main.py for consistency
-from main import DATETIME_STR
-# updates the guid given in two places with the RSS file, essential for letting readers know
-# a new picture has been published
+# this will change between calls due to microseconds
+# better for it just to be a global
+DATETIME_STR = str(datetime.datetime.today()).replace(' ', "-")
+# we don't need those pesky microseconds any way
+DATETIME_STR = DATETIME_STR[:-7]
 
 # refrence: https://cyber.harvard.edu/rss/rss.html#ltguidgtSubelementOfLtitemgt