docs: add Quick start guide for various frameworks

[Pradumnasaraf]

Changes

Added quick start guides for Django, Flask, Next.js, NestJS, Express.js, Gin, Spring Boot, ASP.NET, and Ruby on Rails. Each follows the new structure: Permit CLI setup, SDK integration, user/tenant sync, role assignment, local PDP with Docker, and policy enforcement.

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[Copilot]

Pull Request Overview

This PR adds comprehensive quick start guides for integrating Permit.io into various frameworks and languages. The changes include updates to the sidebar navigation and new MDX documentation files covering Spring Boot, Rails, Next.js, NestJS, Gin, Flask, FastAPI, Express.js, Django, and ASP.NET, along with a category configuration file.

Reviewed Changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sidebars.js	Adds a new "Quick Start Guide" category to the sidebar.
docs/quick-start/spring-boot.mdx	Introduces a guide for integrating Permit.io with Spring Boot.
docs/quick-start/rails.mdx	Introduces a guide for integrating Permit.io with Rails.
docs/quick-start/nextjs.mdx	Introduces a guide for integrating Permit.io with Next.js.
docs/quick-start/nest.mdx	Introduces a guide for integrating Permit.io with NestJS.
docs/quick-start/gin.mdx	Introduces a guide for integrating Permit.io with a Gin (Go) app.
docs/quick-start/flask.mdx	Introduces a guide for integrating Permit.io with Flask.
docs/quick-start/fastapi.mdx	Introduces a guide for integrating Permit.io with FastAPI.
docs/quick-start/express.mdx	Introduces a guide for integrating Permit.io with Express.js.
docs/quick-start/django.mdx	Introduces a guide for integrating Permit.io with Django.
docs/quick-start/aspnet.mdx	Introduces a guide for integrating Permit.io with ASP.NET.
docs/quick-start/category.json	Configures the sidebar category for quick start guides.

[Pradumnasaraf]

Hey, @gemanor, pinging you!

[gemanor]

Nice start for this important task! Please address the following general comments:

1. The Overview section isn't in line with the documentation style. Please look at other pages (the walkthroughs are great example). We should have 2 paragraphs in large text that give a quick overview. All your documents start with an H1 title that cancels this large font introduction
2. The writing style, mainly in the introduction and a little in the documents themselves, doesn't fit our guidelines. Please find more here: https://github.com/permitio/docs/blob/master/CONTRIBUTING.md
   1. See the section on the difference between why and do documents, and follow that
   2. Check and adopt the general writing guidelines
3. The template you choose (the fga-tradeoff) is hard to understand for someone who isn't familiar with Permit. Please do the following:
   1. In a clean environment, create a simple policy that is easy to understand for a common use case (for example, RBAC/ReBAC blogging platform policy)
   2. Export it to a TF file using the command permit env export terraform
   3. Open a PR in the CLI repository to contribute this to the CLI (see example PR here: )
   4. Change the examples to this template with a quick overview of the policy configured
4. The long sections of the timeline components make it really hard to follow. Again, see the example of the utilization of the timeline components in the walkthrough guides, and follow this styling