docs: add latest penpot backups of mock-up app + add non-interactive …

…PDF export (future proof in case compatibility breaks again with future penpot server-side updates)

Signed-off-by: Stephen L. <LRQ3000@gmail.com>

README.md

@@ -16,7 +16,7 @@ The app will be developed with react-native and typescript. Database will likely
 
 Circalog sleep diary format specification, intended to be generic to store a maximum of pertinent data for any kind of circadian periodic event, is readable here: https://github.com/Circadiaware/circalog/blob/main/docs/circalog-format-spec.md
 
-An [interactive mock-up app](https://design.penpot.app/#/view/441c1550-c424-11eb-8557-f55ab9adbb41?page-id=d0e73e20-e124-11eb-a77a-195c36c76d76&section=interactions&index=0&share-id=1bc0a800-1ba4-11ec-9c71-4a8af25a7bed) (working as of March 2024) is available on Penpot (the screenshot above is of this mock-up app). Please use Chrome based browsers preferably, as there may be [an issue](https://github.com/penpot/penpot/issues/1081) with Firefox based browser which makes the text not display correctly, although the mock-up was modified to workaround this issue. The app's background should be black, if it's not, then maybe you are using a dark mode plugin such as Dark Reader, please disable it temporarily when viewing the mock-up app. On mobiles, the default view may be too small, click on the fullscreen button at the top right corner in the Penpot interface to show the app in almost real size. Backup files for the Penpot project are available in the docs folder. Note that this mock-up app was done on an older version of PenPot before there was the Material Design 3 kit, so the mock-up should be redone now with this much nicer kit, so keep in mind that the real implementation will be nicer than this as it will follow Material Design.
+An [interactive mock-up app](https://design.penpot.app/#/view/441c1550-c424-11eb-8557-f55ab9adbb41?page-id=d0e73e20-e124-11eb-a77a-195c36c76d76&section=interactions&index=0&share-id=1bc0a800-1ba4-11ec-9c71-4a8af25a7bed) is available on Penpot, which is an open-source alternative to Figma for apps UI sketching (the screenshot above is from this mock-up app). If the interactive app stops working for any reason, you can either try to import the backup penpot files in the `docs/penpot_backups/latest` folder into your Penpot account or self-hosted, or you can view a [non-interactive export in PDF of this mock-up app](https://github.com/Circadiaware/circalog/blob/main/docs/penpot_backups/latest/Circalog-penpot-mock-up-app.pdf). Please use Chrome based browsers preferably, as there may be [an issue](https://github.com/penpot/penpot/issues/1081) with Firefox based browser which makes the text not display correctly, although the mock-up was modified to workaround this issue. The app's background should be black, if it's not, then maybe you are using a dark mode plugin such as Dark Reader, please disable it temporarily when viewing the mock-up app. On mobiles, the default view may be too small, click on the fullscreen button at the top right corner in the Penpot interface to show the app in almost real size. Backup files for the Penpot project are available in the docs folder. Note that this mock-up app was done on an older version of PenPot before there was the Material Design 3 kit, so the mock-up should be redone now with this much nicer kit, so keep in mind that the real implementation will be nicer than this as it will follow Material Design.
 
 Similar projects:
 * [BabyBuddy](https://github.com/babybuddy/babybuddy), opensource webapp with a native [Android app](https://github.com/babybuddy/babybuddy-for-android) with multiple time trackers, very interesting implementation very similar to circalog, but can only specify what the timer was about at the end, not at the start. Also, graphs and stats are very limited since the goal is not to track sleep disorders. On the plus sides, the app supports being used by multiple different users in different locations since it runs online, and it has an awesome history feature that shows all changes that happened. For baby sleep tracking, it is a very good app, it just needs an export feature to display sleep graphs in other apps.