feat(docs): add guide for symmetric encryption and decryption

- Introduced a comprehensive guide on symmetric encryption, detailing its definition, functionality, and usage.
- Included steps for encrypting and decrypting data using GpgFrontend.
- Provided security tips and scenarios for appropriate use of symmetric encryption.

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----
-title: Symmetric Encryption & Decryption
-sidebar:
-  label: Symmetric Crypto
----
-
-## 🔐 What Is Symmetric Encryption?
-
-**Symmetric encryption** is a method of securing data where the **same
-password** is used to both encrypt and decrypt information.
-
-Unlike **asymmetric encryption**, which uses a public/private key pair,
-symmetric encryption relies on a single shared secret (the password). This
-approach is:
-
-- ✅ Fast and efficient
-- ✅ Ideal for large files or quick one-time sharing
-- ❗ Best used when both parties can safely share the password
-
-> 📌 If someone intercepts the password, the encrypted data is no longer secure
-> — so always handle password exchange carefully.
-
-## 🔄 How It Works
-
-1. You choose a **strong password**.
-2. That password is used to **encrypt** the data.
-3. Anyone with the **same password** can **decrypt** it.
-4. No key pair is required — only the shared password.
-
-> 📎 Encryption security depends entirely on the strength and secrecy of the
-> password used.
-
-## ✍️ Encrypting Data Symmetrically
-
-To encrypt text using symmetric encryption in GpgFrontend (v2.1.9 and later):
-
-Enable Symmetric Encryption Feature
-
-1. Go to the Settings.
-2. Under the Appearance tab, check the `Sym. Encrypt` checkbox to enable symmetric encryption functionality.
-
-Access the Symmetric Encryption Button
-
-1. After enabling, you’ll see a dedicated `Sym. Encrypt` button on the main interface.
-
-Enter the Text or Select a File
-
-- Input the plaintext you wish to protect in the text editor.
-- Select a file to encrypt using the file panel.
-
-Symmetric Encryption
-
-1. Without selecting any public key, click the `Sym. Encrypt` button.
-2. When prompted, enter a strong, unique password.
-3. This password becomes your encryption key.
-4. The text or file will be encrypted into ciphertext.
-5. You can save or share the encrypted result.
-
-> 🔐 The recipient will need the **exact same password** to decrypt the message.
-
-## 🔓 Decrypting Symmetric Encrypted Data
-
-To decrypt content that was encrypted symmetrically:
-
-1. Paste the Ciphertext: The message should begin with `-----BEGIN PGP MESSAGE-----` and end with `-----END PGP MESSAGE-----`.
-2. Initiate Decryption: Choose to decrypt the message.
-3. Enter the Password: Input the **same password** that was used for
-   encryption.
-4. View the Plaintext: If the password is correct, the original message will be revealed.
-
-> 🧠 If the password is incorrect or mistyped, decryption will fail.
-
-## 💡 When to Use Symmetric Encryption?
-
-Symmetric encryption is a great choice when:
-
-- You’re encrypting something **for yourself** (e.g. storing private notes or
-  backup files).
-- You’re sharing data over a **secure channel**, and can **safely provide the
-  password**.
-- You don’t want to manage public/private key infrastructure.
-
-However, it is **not ideal** for public communication where secure password
-exchange is difficult.
-
-## 🛡️ Tips for Better Security
-
-- Always use a **strong, complex password** (longer is better).
-- Never send passwords through insecure channels (e.g., unencrypted email).
-- Consider using symmetric encryption as a supplement to public-key encryption —
-  e.g., encrypt a file symmetrically, then encrypt the password with the
-  recipient’s public key.