fix: heading can't be the first item in your resource

[adrianthedev]

Description

Fixes #1123

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Manual review steps

1. Configure a resource to have a heading as the first item in the DSL
2. Observe the show page loads

Manual reviewer: please leave a comment with output from the test if that's the case.

[codeclimate]

Code Climate has analyzed commit dc3e748 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #1124 (629b3b8) into main (fed8189) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 629b3b8 differs from pull request most recent head dc3e748. Consider uploading reports for the commit dc3e748 to get more accurate results

@@           Coverage Diff           @@
##             main    #1124   +/-   ##
=======================================
  Coverage   94.18%   94.18%           
=======================================
  Files         530      530           
  Lines       10560    10561    +1     
=======================================
+ Hits         9946     9947    +1     
  Misses        614      614           

Impacted Files	Coverage Δ
lib/avo/concerns/has_fields.rb	75.00% <100.00%> (+0.17%)	⬆️

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[github-actions]

This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.