Added two developer guide and removed from README ' builder docker image' and 'launch service from source' (#2590)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

docs/guides/develop/launch_ragflow_from_source.md

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+---
+sidebar_position: 2
+slug: /launch_ragflow_from_source
+---
+
+# Launch the RAGFlow Service from Source 
+
+A guide explaining how to set up a RAGFlow service from its source code. By following this guide, you'll be able to debug using the source code.
+
+## Target Audience
+
+Developers who have added new features or modified existing code and wish to debug using the source code, *provided that* their machine has the target deployment environment set up.
+
+## Prerequisites
+
+- CPU ≥ 4 cores
+- RAM ≥ 16 GB
+- Disk ≥ 50 GB
+- Docker ≥ 24.0.0 & Docker Compose ≥ v2.26.1
+
+:::tip NOTE
+If you have not installed Docker on your local machine (Windows, Mac, or Linux), see the [Install Docker Engine](https://docs.docker.com/engine/install/) guide.
+:::
+
+## Launch the Service from Source
+
+To launch the RAGFlow service from source code:
+
+### Clone the RAGFlow Repository
+
+```bash
+git clone https://github.com/infiniflow/ragflow.git
+cd ragflow/
+```
+
+### Install Python dependencies
+
+1. Install Poetry:
+   
+   ```bash
+   curl -sSL https://install.python-poetry.org | python3 -
+   ```
+
+2. Configure Poetry:
+
+   ```bash
+   export POETRY_VIRTUALENVS_CREATE=true POETRY_VIRTUALENVS_IN_PROJECT=true
+   ```
+
+3. Install Python dependencies:
+
+   ```bash
+   ~/.local/bin/poetry install --sync --no-root
+   ```
+   *A virtual environment named `.venv` is created, and all Python dependencies are installed into the new environment.*
+
+### Launch Third-party Services
+
+The following command launches the 'base' services (MinIO, Elasticsearch, Redis, and MySQL) using Docker Compose:
+
+```bash
+docker compose -f docker/docker-compose-base.yml up -d
+```
+
+### Update `host` and `port` Settings for Third-party Services
+
+1. Add the following line to `/etc/hosts` to resolve all hosts specified in **docker/service_conf.yaml** to `127.0.0.1`:
+
+   ```
+   127.0.0.1       es01 mysql minio redis
+   ```
+
+2. In **docker/service_conf.yaml**, update mysql port to `5455` and es port to `1200`, as specified in **docker/.env**.
+
+### Launch the RAGFlow Backend Service
+
+1. Comment out the `nginx` line in **docker/entrypoint.sh**.
+
+   ```
+   # /usr/sbin/nginx
+   ```
+
+2. Activate the Python virtual environment:
+
+   ```bash
+   source .venv/bin/activate
+   export PYTHONPATH=$(pwd)
+   ```
+
+3. **Optional:** If you cannot access HuggingFace, set the HF_ENDPOINT environment variable to use a mirror site:
+ 
+   ```bash
+   export HF_ENDPOINT=https://hf-mirror.com
+   ```
+
+4. Run the **entrypoint.sh** script to launch the backend service:
+
+   ```
+   bash docker/entrypoint.sh
+   ```
+
+### Launch the RAGFlow frontend service
+
+1. Navigate to the `web` directory and install the frontend dependencies:
+
+   ```bash
+   cd web
+   npm install --force
+   ```
+
+2. Update `proxy.target` in **.umirc.ts** to `http://127.0.0.1:9380`:
+
+   ```bash
+   vim .umirc.ts
+   ```
+
+3. Start up the RAGFlow frontend service:
+
+   ```bash
+   npm run dev 
+   ```  
+
+   *The following message appears, showing the IP address and port number of your frontend service:*  
+
+   ![](https://github.com/user-attachments/assets/0daf462c-a24d-4496-a66f-92533534e187)
+
+### Access the RAGFlow service
+
+In your web browser, enter `http://127.0.0.1:<PORT>/`, ensuring the port number matches that shown in the screenshot above.