docs(mcp): add MCP how to workflow guides

[georgianastasov]

Closes #6442

Description:

Adds Angular-specific MCP workflow documentation based on the shared MCP topic structure, adapted for Ignite UI for Angular.

Checklist:

• check topic's TOC/menu and paragraph headings
• Include TOC topic labels in topic content has a valuable update, it's new or considered as preview\ beta
• link to other topics using ../relative/path.md
• at the References section at the end of the topic add links to topics, samples, etc
• reference API documentation instead of adding a section with API

• use valid component names - [Data] Grid, IgxSelectComponent, <igx-combo>
• use spell checker tool (VS Code, Grammarly, Microsoft Editor)
• add inline code blocks for the names of classes / tags / properties
• add language descriptor for the code blocks
• check broken links (use browser add-on)
• check if sample is working and fully visible in the topic
• check if sample is working and fully visible in the StackBlitz
• check if code blocks match the code in StackBlitz demo

• follow SEO guidelines to fill topic's metadata (SEO guidelines)

• do not resolve requested changes (leave that to the reviewer)
• add pending-localization label when the review of the PR is done
• add a member from the localization team to translate it

[Copilot]

Pull request overview

Adds new “How to” workflow documentation for using Ignite UI CLI MCP with Angular (overview + three setup paths) and exposes these topics in the components documentation TOC.

Changes:

• Added 4 new MCP workflow guides under en/components/general/how-to/ (overview, empty-folder flow, CLI-first flow, existing-project flow).
• Updated en/components/toc.yml to include the new MCP topics under General → How to.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
en/components/toc.yml	Adds new navigation entries for the MCP workflow guides.
en/components/general/how-to/general-how-to-mcp-overview.md	Introduces an MCP overview + links to the setup-path topics.
en/components/general/how-to/general-how-to-start-mcp.md	Documents the “empty folder” MCP-first setup flow.
en/components/general/how-to/general-how-to-start-mcp-cli-project.md	Documents the “create with CLI first, then use MCP” flow (contains a broken link to CLI overview).
en/components/general/how-to/general-how-to-use-mcp-existing-project.md	Documents connecting MCP to an existing Angular project and continuing development.

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[radomirchev]

See last commits

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

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[Copilot]

The front matter sets last_updated: "2025-04-03", which appears inconsistent with this being a newly added topic (and is the only last_updated field in the repo). This can mislead readers and may be ignored by the docs pipeline if the field isn’t supported. Consider either removing last_updated entirely to match existing topic metadata, or updating it to the actual publish/update date and standardizing the field across the docs if it’s intended to be used.

Suggested change

last_updated: "2025-04-03"