docs: simplify installation instructions and remove pre-release/dev options

Author: x0sina

README-fa.md

@@ -137,7 +137,7 @@
 
 **TimescaleDB (توصیه شده):**
 ```bash
-sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb --pre-release
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb
 ```
 
 **SQLite:**

README-ru.md

@@ -137,7 +137,7 @@ PasarGuard — это удобный, многофункциональный и
 
 **TimescaleDB (Рекомендуется):**
 ```bash
-sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb --pre-release
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb
 ```
 
 **SQLite:**

README-zh-cn.md

@@ -137,7 +137,7 @@ PasarGuard 是一个用户友好、功能丰富且可靠的代理管理工具。
 
 **TimescaleDB（推荐）：**
 ```bash
-sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb --pre-release
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb
 ```
 
 **SQLite：**

README.md

@@ -128,41 +128,30 @@ PasarGuard is a user-friendly, feature-rich, and reliable proxy management tool.
 
 ---
 
-- **Install pasarguard with SQLite**:
-
-  ```bash
-  sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install
-  ```
-
-- **Install pasarguard with MySQL**:
-
-  ```bash
-  sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database mysql
-  ```
-
-- **Install pasarguard with PostgreSQL**:
-
-  ```bash
-  sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database postgresql
-  ```
-
-- **Install pasarguard with TimescaleDB(v1+ only) and pre-release version**:
-
-  ```bash
-  sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb --pre-release
-  ```
+**TimescaleDB (Recommended):**
+```bash
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database timescaledb
+```
 
-- **Install pasarguard with MariaDB and Dev branch**:
+**SQLite:**
+```bash
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install
+```
 
-  ```bash
-  sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database mariadb --dev
-  ```
+**MySQL:**
+```bash
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database mysql
+```
 
-- **Install pasarguard with MariaDB and Manual version**:
+**MariaDB:**
+```bash
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database mariadb
+```
 
-  ```bash
-  sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database mariadb --version v0.5.2
-  ```
+**PostgreSQL:**
+```bash
+sudo bash -c "$(curl -fsSL https://github.com/PasarGuard/scripts/raw/main/pasarguard.sh)" @ install --database postgresql
+```
 
 ### 📋 After installation: