Add a new algorithm guide

[langestefan]

A tutorial on adding new algorithms to SolarPosition.jl.

[Copilot]

Pull request overview

This PR adds comprehensive documentation guides for SolarPosition.jl and reorganizes the documentation structure from "examples/" to "guides/". The primary addition is a detailed tutorial on how to add new solar position algorithms to the package.

Key Changes

• Added a new comprehensive guide for contributing new algorithms (new-algorithm.md)
• Reorganized documentation from examples/ to guides/ directory
• Moved existing documentation files to the new structure with updated cross-references

Reviewed changes

Copilot reviewed 6 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
examples/benchmark_threading.jl	Updated path references from examples/ to guides/
docs/src/index.md	Updated ModelingToolkit extension reference to new path
docs/src/guides/plotting.md	New guide for plotting with Makie.jl (moved from examples)
docs/src/guides/parallel.md	New guide for parallel computing with OhMyThreads.jl (moved from examples)
docs/src/guides/new-algorithm.md	New comprehensive tutorial for adding solar position algorithms
docs/src/guides/modelingtoolkit.md	New guide for ModelingToolkit.jl integration (moved from examples)
docs/src/guides/getting-started.md	New getting started guide (moved from examples)
docs/src/contributing.md	Added reference to new algorithm guide
docs/make.jl	Updated documentation structure from "Examples" to "Guides"
.codecov.yml	Updated coverage ignore path from examples/ to guides/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.02%. Comparing base (ebf3b44) to head (4552bf5).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files          15       15           
  Lines         511      511           
=======================================
  Hits          506      506           
  Misses          5        5           

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