Update docs to reflect awesome-copilot as default plugin marketplace in CLI and VS Code

[Copilot]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

Awesome Copilot is now a default plugin marketplace in both Copilot CLI and VS Code — no manual plugin marketplace add step required. This PR updates all relevant documentation to reflect that fact, and adds VS Code discovery paths that were previously absent.

• eng/constants.mjs: Updated the pluginsSection and pluginsUsage template strings — the true source for docs/README.plugins.md — with a default marketplace callout, the /plugin marketplace browse awesome-copilot CLI slash command, and VS Code access methods (@agentPlugins in Extensions search and Chat: Plugins in Command Palette).
• docs/README.plugins.md: Regenerated via npm run build from the updated templates in eng/constants.mjs.
• website/src/pages/plugins.astro: Added a visible "how to access" info panel above the plugin list covering both CLI and VS Code.
• website/src/content/learning-hub/installing-and-using-plugins.md (+ symlinked docs copy): Updated "Finding Plugins" to clarify no setup is needed; added "Browsing in VS Code" and separate "From Copilot CLI" / "From VS Code" install subsections.

Note: README.md changes were intentionally excluded from this PR as they are covered by #900.

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Type of Contribution

• Update to existing instruction, prompt, agent, plugin, skill, or workflow.

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Additional Notes

docs/README.plugins.md is generated by eng/update-readme.mjs using templates from eng/constants.mjs. The plugin section templates were updated at the source so the generated file stays correct on future builds.

The Learning Hub article at website/src/content/docs/learning-hub/installing-and-using-plugins.md is a symlink to the learning-hub/ copy and picks up all changes automatically.

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[aaronpowell]

@copilot due to #900 we probably don't want to update the main README, but what about README.plugins.md?

[Copilot]

@copilot due to #900 we probably don't want to update the main README, but what about README.plugins.md?

Reverted the README.md changes in 2849d91 — those will be left to #900. The docs/README.plugins.md now has the default marketplace callout, CLI slash command, and VS Code access methods.

[aaronpowell]

@copilot isn't the header of the README.plugins.md from a JS file? that'll need updating too

[Copilot]

@copilot isn't the header of the README.plugins.md from a JS file? that'll need updating too

Good catch — the header comes from eng/constants.mjs. Updated the pluginsSection and pluginsUsage templates there in 0e56450 and re-ran npm run build so docs/README.plugins.md is regenerated correctly and will stay correct on future builds.

[Copilot]

Pull request overview

Updates documentation and website UI to reflect that awesome-copilot is now a default plugin marketplace in both Copilot CLI and VS Code, and adds explicit VS Code discovery/install guidance.

Changes:

• Add “default marketplace / no setup required” callouts plus CLI/VS Code discovery paths in generated plugin docs content.
• Update Learning Hub “Installing and Using Plugins” article with separate CLI vs VS Code browsing/install sections.
• Add a “how to access” info panel to the website Plugins directory page.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
website/src/pages/plugins.astro	Adds a visible “how to access” panel (CLI + VS Code discovery/install pointers) above the plugin list.
website/src/content/learning-hub/installing-and-using-plugins.md	Clarifies default marketplaces and adds VS Code browsing + install guidance alongside CLI instructions.
eng/constants.mjs	Updates the source templates used to generate docs/README.plugins.md with new CLI/VS Code guidance.
docs/README.plugins.md	Regenerated plugin README content reflecting the updated templates.

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[Copilot]

pluginsUsage is escaping inline-code backticks with \\\`` which likely renders as literal backticks (not inline code) in the generated markdown. Use the same pattern as elsewhere in this file (`inside the template literal) so the output contains plain Markdown inline code (``...` ``) without leading backslashes, then regenerate the README output.

Suggested change

	- Browse the marketplace from within an interactive Copilot session: \\\`/plugin marketplace browse awesome-copilot\\\`
	- Install a plugin: \\\`copilot plugin install <plugin-name>@awesome-copilot\\\`
	**Find & Install in VS Code:**
	- Open the Extensions search view and type \\\`@agentPlugins\\\` to browse available plugins
	- Or open the Command Palette and run \\\`Chat: Plugins\\\``,
	- Browse the marketplace from within an interactive Copilot session: \`/plugin marketplace browse awesome-copilot\`
	- Install a plugin: \`copilot plugin install <plugin-name>@awesome-copilot\`
	**Find & Install in VS Code:**
	- Open the Extensions search view and type \`@agentPlugins\` to browse available plugins
	- Or open the Command Palette and run \`Chat: Plugins\``,

[Copilot]

These list items escape the inline-code backticks (e.g., \/plugin marketplace browse...`). In Markdown, `prevents inline code rendering and shows literal backticks instead. Regenerate this file after fixing the source template so these use normal inline code formatting (``...` ``) without backslashes.

Suggested change

	- Browse the marketplace from within an interactive Copilot session: \`/plugin marketplace browse awesome-copilot\`
	- Install a plugin: \`copilot plugin install <plugin-name>@awesome-copilot\`
	**Find & Install in VS Code:**
	- Open the Extensions search view and type \`@agentPlugins\` to browse available plugins
	- Or open the Command Palette and run \`Chat: Plugins\`
	- Browse the marketplace from within an interactive Copilot session: `/plugin marketplace browse awesome-copilot`
	- Install a plugin: `copilot plugin install <plugin-name>@awesome-copilot`
	**Find & Install in VS Code:**
	- Open the Extensions search view and type `@agentPlugins` to browse available plugins
	- Or open the Command Palette and run `Chat: Plugins`