docs: use DocC for API documentation

[cbaker6]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

DocC is now able to build static webpages for GitHub pages and can replace Jazzy.

Related issue: #n/a

Approach

Replace Jazzy with DocC for documentation.

TODOs before merging

• [x] Add entry to changelog
• [x] Add changes to documentation (guides, repository pages, in-code descriptions)

[parse-github-assistant[bot]]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[codecov[bot]]

Codecov Report

Merging #350 (57b181a) into main (eb755d2) will increase coverage by 0.68%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #350      +/-   ##
==========================================
+ Coverage   87.32%   88.00%   +0.68%     
==========================================
  Files         114      114              
  Lines       12209    12209              
==========================================
+ Hits        10661    10745      +84     
+ Misses       1548     1464      -84     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseUser+async.swift	100.00% <ø> (ø)
Sources/ParseSwift/Objects/ParseUser+combine.swift	95.55% <ø> (ø)
Sources/ParseSwift/Objects/ParseUser.swift	86.12% <ø> (ø)
Sources/ParseSwift/Types/QueryConstraint.swift	97.92% <ø> (ø)
Sources/ParseSwift/Types/Query.swift	94.33% <0.00%> (+0.12%)	:arrow_up:
Sources/ParseSwift/Objects/ParseObject.swift	85.03% <0.00%> (+0.15%)	:arrow_up:
Sources/ParseSwift/Coding/ParseEncoder.swift	77.66% <0.00%> (+0.22%)	:arrow_up:
Sources/ParseSwift/Storage/ParseFileManager.swift	92.57% <0.00%> (+0.57%)	:arrow_up:
Sources/ParseSwift/API/API+Command.swift	89.21% <0.00%> (+0.82%)	:arrow_up:
Sources/ParseSwift/Extensions/URLSession.swift	76.55% <0.00%> (+1.91%)	:arrow_up:
... and 12 more

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