feat(licensing): updates for licensing and getting started for OSS changes

[ChronosSF]

Closes #

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

This PR updates documentation to reflect Ignite UI for Angular's transition to a dual-license model, differentiating between open-source (MIT) and commercial components. The updates clarify licensing requirements, installation procedures, and upgrade paths for both trial and licensed versions.

Key Changes:

• Introduction of dual-license model documentation with references to open-source vs premium component distinctions
• Updated license terms and subscription model date from Q2 2020 to Q4 2025
• Addition of Grid Lite (MIT-licensed) component installation and upgrade information

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
en/components/general/ignite-ui-licensing.md	Updates licensing documentation to reflect dual-license model, corrects grammar, and clarifies trial/licensed package differences
en/components/general/getting-started.md	Adds dual-license model information, includes Grid Lite installation steps, and updates trial-to-licensed upgrade guidance

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