feat: split Slovenia 2024 into its own trip

Move Piran entry out of us-canada-mex-2024 into a new slovenia-2024 trip.
Rename entry folder to match the post title convention.
Fix us-canada-mex-2024 date_start to 2024-07-21 (first actual US entry).

pages/01.trips/us-canada-mex-2024/01.dailies/2024-05-28-pixelfed-1.entry/entry.md

@@ -1,15 +0,0 @@
----
-title: 'Ice Cream and Old Walls in Piran'
-date: '2024-05-28 07:03'
-template: entry
-published: true
-hero_image: 'photo-1.jpg'
-lat: ''
-lng: ''
-location_city: ''
-location_country: ''
-weather_temp_c: ''
-weather_desc: ''
----
-
-A sunny day in Piran. We drove from Ljubljana through the beautiful Slovenian countryside. The more west we went, the more Mediterranean the landscape felt. Piran is a cute, Mediterranean harbor town, with little streets, squares and no cars. The view from the old fortification walls was great and the climb in the warm weather gave us a sense of accomplishment which we rewarded with a well deserved ice cream.

pages/01.trips/us-canada-mex-2024/trip.md

@@ -1,8 +1,8 @@
 ---
 title: 'Northern America 2024'
 template: trip
-date: '2024-05-28'
-date_start: '2024-05-28'
+date: '2024-07-21'
+date_start: '2024-07-21'
 date_end: '2024-08-07'
 cover_image: ''
 ---