docs(vue-press): updating getting started

[eikeland]

Updated getting-started.md documentation to:

• Correct JSON code block formatting.
• Update app.config.ts example to use defineAppConfig directly without mergeAppConfigs.
• Provide an example of configuring an HTTP client with endpoint details from environment configuration.

[changeset-bot]

🦋 Changeset detected

Latest commit: b708080

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@equinor/fusion-framework-cli	Patch
@equinor/fusion-framework-docs	Patch
@equinor/fusion-framework-cookbook-app-react-context-custom-error	Patch
@equinor/fusion-framework-cookbook-app-react-context	Patch
@equinor/fusion-framework-cookbook-app-react-feature-flag	Patch
poc-portal	Patch

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	0.39%	1746 / 440975
🔵	Statements	0.39%	1746 / 440975
🔵	Functions	23.8%	219 / 920
🔵	Branches	37.34%	400 / 1071

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
packages/cli/src/lib/app-config.ts	0%	0%	0%	0%	1, 9, 11, 13, 25-26, 28-29, 31-32, 34-44, 46-63

Generated in workflow #7886 for commit b708080 by the Vitest Coverage Report Action