Add grace period and fix bugs

CHANGELOG.md

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+# Changelog
+This file keeps track of changes in more human-readable fashion
+
+# 5 May 2024
+* Added this changelog
+* Added grace period (as per suggestions)
+  * Set in config like `grace_period=3h26m` (via Go's `time.ParseDuration`)
+  * Defines how long the app should wait before switching to next day.
+  The example provided means you will still be editing yesterday's file at 3am, but at 3:27am it will be a new day
+  * When in effect, the header will show "(grace period active)" next to actual date
+  * Fun fact: if you suddenly increase the setting mid-day, you can have a "Tomorrow" in previous days list! :)
+  * This feature came with some free minor bug-fixes 'cause I had to re-check time management code.
+  Now let's hope it doesn't introduce any new ones! :D
+* Began adding PWA manifest.json
+  * This will allow for (slightly) better mobile experience
+  * Still missing an icon, will be likely installable once I make one and test the app :D
+  * Known issue: making notes is impossible in the PWA, since you can't navigate to arbitrary page. 
+  I might leave it as a WONTFIX or try to find a workaround
+* Date is now shown in local language if possible (in case you add your own or use Russian)
+* Bug fixes
+  * "Today" redirect from days list no longer uses UTC
+  * Date JS script no longer uses UTC
+  * The API no longer uses UTC for today
+  * `/public/` files is no longer behind auth
+  * Removed Sigmund® Corp. integration :)