💡 Updated fixtures to make it easier to get started

[matthanley]

• Our old fixtures were designed as a guide to getting started to Ghost, but they got in the way
• The old fixtures now live as part of ghost.org/resources - a living guide to starting with Ghost
• These new fixtures mean the site is ready to go as soon as it's setup

[github-actions]

It looks like this PR contains a migration 👀
Here's the checklist for reviewing migrations:

General requirements

• Satisfies idempotency requirement (both up() and down())
• Does not reference models
• Filename is in the correct format
• Targets the next minor version
• All code paths have appropriate log messages
• Uses the correct utils
• Contains a minimal changeset
• Does not mix DDL/DML operations

Schema changes

• Both schema change and related migration have been implemented
• For index changes: has been performance tested for large tables
• For new tables/columns: fields use the appropriate predefined field lengths
• For new tables/columns: field names follow the appropriate conventions
• Does not drop a non-alpha table outside of a major version

Data changes

• Mass updates/inserts are batched appropriately
• Does not loop over large tables/datasets
• Defends against missing or invalid data
• For settings updates: follows the appropriate guidelines

[codecov]

Codecov Report

Merging #14299 (1bc22b0) into main (c4470ff) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main   #14299      +/-   ##
==========================================
- Coverage   55.48%   55.45%   -0.03%     
==========================================
  Files         565      565              
  Lines       46860    46883      +23     
  Branches     3898     3898              
==========================================
  Hits        26001    26001              
- Misses      20820    20843      +23     
  Partials       39       39              

Impacted Files	Coverage Δ
core/server/services/auth/setup.js	0.00% <0.00%> (ø)

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