docs: Manual Installation section & Restructured pages

[TechAkayy]

This PR covers:

1. Minor updates to the docs.
2. Manual installation section in the Getting Started page
   • To help new users who want to use Iles in their existing projects.
   • Used npm for the commands as it comes default with nodejs, and have also been used in other pages too. Sticking with npm commands will be easy especially for new users and ensures consistency. So does vue, nuxt, vite, vitepress, astro docs.
3. Restructuring the docs pages with the following changes:
   • Renaming "Routing" to "Pages"
   • Renaming "Development" to "Project Structure"
   • Reorder - Pages, then Markdown, then Documents.

@ElMassimo, I have pushed each of the above as separate commits, feel free to de-scope the restructing of the pages if you want to keep the structure as-is.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit f6962c1.

Command	Status	Duration	Result
nx run-many --target=build --all --exclude docs...	✅ Succeeded	1s	View ↗
nx run-many --target=lint --all	✅ Succeeded	<1s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-01-17 11:14:15 UTC

[TechAkayy]

I will be following up with futher PRs (fixes and feature) where I will be addressing some complexities in the this getting-started update. Specifically, simplify workflow by:

• Making site.ts & app.ts optional, so that user just have to do npm add -D iles and run npx iles build, similar to Vitepress.

[TechAkayy]

Superseded by new set of PRs covering a range of docs update