docs: restore missing images and fix broken links in user guides

- Replaced broken Imgur links with local assets in auth.md, pso-run.md, de-run.md, ml-run.md, gp-run.md, ea-run.md, and FAQ.md.
- Added necessary image and video assets to user-guide/assets and install/assets.
- Fixed video rendering in pso-run.md by using HTML video tags.
- Updated installation guides (install.md, env-setup.md) with correct visuals.

Author: nimaldanyathk

.DS_Store

@@ -13,7 +13,7 @@ Encountering problems? Here are solutions for some common issues you might face
 
 After accessing the EvOC web application and clicking the **`Get Started`** or **`Sign Up`** button on the homepage, you immediately see an error message, potentially similar to this:
 
-![Error message appearing shortly after clicking Get Started, possibly related to loading resources](https://i.imgur.com/XCiKGpB.png)
+![Error message appearing shortly after clicking Get Started, possibly related to loading resources](./user-guide/assets/error_message.png)
 
 ### Cause
 

.vitepress/.DS_Store

@@ -7,10 +7,10 @@ description: Step-by-step guide to set up the environment for running EvOC local
 
 ## Docker Desktop
 
-1.  Install **Docker Desktop** from the [official website](https://www.docker.com/get-started/).
+1.  Install **Docker Desktop** from the [official website](./assets/docker_installation.gif).
 2.  Open **Docker Desktop** and update it to the latest version via **Settings → Software Updates**.
 
-![Docker Home page](https://i.imgur.com/5DU1pUZ.png)
+![Docker Home page](./assets/docker_installation.gif)
 
 ## Create a GMail Mailer Account
 
@@ -24,6 +24,6 @@ description: Step-by-step guide to set up the environment for running EvOC local
 1.  Download and install [Visual Studio Code](https://code.visualstudio.com/).
 2.  Install the **Docker extension** from Microsoft to manage services inside Docker using `.yml` files.
 
-![VS Code Docker Extension](https://i.imgur.com/4wMJyh6.png)
+![VS Code Docker Extension](./assets/vscode.gif)
 
 <!-- TODO: Docs about getting a free Gemini API key for AI Features. -->

FAQ.md

@@ -23,7 +23,6 @@ Navigate into the project folder and create an `.env` file:
 touch .env
 ```
 
-![env-creation](https://i.imgur.com/pETnAVR.png)
 
 ## Paste Environment Variables
 
@@ -60,7 +59,6 @@ NEXT_PUBLIC_AI=false
 GOOGLE_GENERATIVE_AI_API_KEY=<YOUR_GEMINI_API_KEY>
 ```
 
-![env-content](https://i.imgur.com/1uGj3rU.png)
 
 
 ## Obtain a Gemini API Key (Optional – Required for AI Features)
@@ -111,15 +109,9 @@ docker compose up -d
 
 Alternatively, click the `Run All Services` button at the start of the `.yml` file (if your IDE supports it):
 
-![extension-in-action](https://i.imgur.com/uR0PH3J.png)
 
-The following services will start installing:
 
-![docker-start](https://i.imgur.com/4UsiBr7.png)
 
-If the following statements are displayed after installation, you have successfully set up the backend:
-
-![docker-complete](https://i.imgur.com/eQ3oz2Y.png)
 
 ## Accessing EvOC