fix: return types and laravel helper function

[repat]

Summary

• Changed array_only to Arr::only, since the helper package is not necessarily installed
• Fixed return types
• Updated link to documentation

Why are these changes necessary?

I couldn't use the package, the return types are part of PHP and therefore a hard error and not possible try/catch.

How were these changes implemented?

See changed files, it's not much :)

Checklist

• Documentation (if necessary)
• Tests (if necessary) -> there are no tests?
• Ready to be merged

➜ ./vendor/bin/phpunit
PHPUnit 9.3.10 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.4.10
Configuration: /.../laravel-1/phpunit.xml.dist
Warning:       Your XML configuration validates against a deprecated schema.
Suggestion:    Migrate your XML configuration using "--migrate-configuration"!

No tests executed!

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[codecov]

Codecov Report

Merging #28 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##             master     #28   +/-   ##
========================================
  Coverage      0.00%   0.00%           
  Complexity       16      16           
========================================
  Files             4       4           
  Lines            52      52           
========================================
  Misses           52      52           

Impacted Files	Coverage Δ	Complexity Δ
src/ArkFactory.php	0.00% <0.00%> (ø)	5.00 <1.00> (ø)
src/ArkManager.php	0.00% <0.00%> (ø)	4.00 <1.00> (ø)

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