Update simplenote to 2.8.0

Summary:
Changelog:

• Enhancements
  • Added Untagged Notes filter to sidebar
  • Added a confirmation dialog before deleting a tag
  • Updated the navigation bar styles
  • Updated navigation bar color
  • Updated tag input styling
  • Updated styling of dialogs throughout the app
  • Auto-remove line terminators like line separators (LS) or paragraph separator (PS)
  • Updated new account signup flow

• Fixes
  • Ensure that tags on imported notes are added and synced properly
  • Fixed overflowing dialog content when a long email address is used during signup
  • Fixed a bug in note export to avoid duplicate filenames when certain characters were used in the note title
  • Updated the view when no notes show in a specific list; fixed the view when adding a new note from the Trash
  • Enable keyboard shortcut for search even when keyboard shortcut preference is set to be disabled
  • Fixed a bug that caused Ctrl+G and some other shortcuts to fail
  • Refresh the note list after restoring a revision
  • Removed the spellcheck option from the Edit menu

Signed-off-by: Algent Albrahimi <algent@protonmail.com>

Test Plan:

• Enable/disable markdown formating and preview the notes.
• Add and remove tags.
• Pin notes and remove the pins.
• Publish a note and check the link.
• Export notes as TXT in a ZIP file.
• Import note from a TXT file.

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D10774