docs(deployments): add Commit to Git step page (#3196)

Document the new Commit to Git built-in step under a new Deployments > Git
area. Covers the destination repository, commit message, commit method,
input files, optional script, step verification, execution flow, and output
variables, plus the Early Access caveats around credential types and pull
request support.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(deployments): align output variables table to fix markdownlint MD060

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* yay

* before merge

* docs(deployments): refine Commit to Git step content

- Remove the paragraph comparing the step to the Helm and script steps.
- Clarify that the script runs after input sources are copied.
- Document the CommitToGit.CommitSha output variable and how to resolve it
  via Octopus.Action[<step>].Git.CommitDetailsActionName.
- Replace the incorrect flat-copy note with accurate warnings on wildcard
  prefix removal and relative source/destination paths.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(deployments): add RepositoryPath script examples as language tabs

Show a basic script that uses Octopus.Calamari.Git.RepositoryPath in
PowerShell, C#, Bash, and Python, grouped into tabs with the
data-group details pattern.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* back out the subfolder, rename to sub-folder(s)

* add sub-image files

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rain-on