Rename the "Explain It Like I'm 64" folder to "guides"

[dbeatty10]

resolves N/A

Problem

We have a folder with a placeholder name that is not intuitive: eli64

Solution

Standardize along with dbt-common and dbt-adapters on a better name: guides.

Checklist

• I have read the contributing guide and understand what's expected of me

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.61%. Comparing base (751139d) to head (d8057ae).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10141      +/-   ##
==========================================
- Coverage   88.63%   88.61%   -0.02%     
==========================================
  Files         180      180              
  Lines       22422    22422              
==========================================
- Hits        19874    19870       -4     
- Misses       2548     2552       +4     

Flag	Coverage Δ
integration	85.98% <ø> (-0.10%)	⬇️
unit	62.87% <ø> (ø)

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[aranke]

LGTM, better than my proposal of $$eli_(2^6)$$