wiki: add wiki for DEX trading account management (#2468)

* wiki: add wiki for DEX trading account management

Signed-off-by: Philemon Ukane <[email protected]>

docs/wiki/DEX-Trading-Account-Management.md

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+# Guide to Managing Your DEX Trading Account
+
+In this guide, we will discuss how you can manage your DEX Trading Account.
+
+Let's get started!
+
+## Setting Up Your DEX Trading Account
+
+Before you can start buying and selling on Decred DEX, you'll need a DEX trading
+account. If you've already followed all the steps in the [Initial Setup
+Guide](https://github.com/decred/dcrdex/wiki/Client-Installation-and-Configuration#initial-setup), you're all
+set. If not, let's create your DEX trading account together:
+
+1. Go to the `Markets` Page.
+2. Find the `Create Account` button and click it.
+
+    <img src="./images/create-account-market-page.png" width="300">
+
+3. Follow the steps in the [Initial Setup Guide](https://github.com/decred/dcrdex/wiki/Client-Installation-and-Configuration#initial-setup) from step 4.
+
+**IF** you've already created the wallet you plan to use and funded it with the
+required bond amount, you can skip steps 6 and 7 of the [Initial Setup
+Guide](https://github.com/decred/dcrdex/wiki/Client-Installation-and-Configuration#initial-setup).
+
+## Exporting your DEX Trading Account
+
+If you want to use your DEX trading account on another device, you'll need to
+export it. Here's how you can do it:
+
+1. Go to the `Settings` Page.
+2. Click on the DEX account in the `Registered Dexes` list. In this example, it
+   will be `dex.decred.org:7232 ⚙️`
+
+    <img src="./images/dex-account-settings.png" width="300">
+
+3. On the DEX account settings page, click `Export Account`.
+4. Select the directory where you want to save the `.json` file.
+
+**Note**: Make sure to keep your exported account file safe. Anyone with access
+to this file can use your DEX trading account.
+
+## Adding an existing DEX Trading Account
+
+If you have an existing DEX account that you want to use with a new setup, here's how you can do it:
+
+1. Go to the `Settings` Page.
+2. Click on `Import Account`.
+
+    <img src="./images/dex-account-import.png" width="300">
+
+3. Choose the exported DEX account `.json` file by clicking on `load from file`.
+
+    <img src="./images/import-dex-from-file.png" width="300">
+
+4. Click `Authorize Import`.
+
+Easy as that!
+
+## Disabling a DEX Trading Account
+
+If you want to temporarily disable your DEX trading account, follow these steps:
+
+1. Visit the DEX account settings as in [Exporting your DEX Trading Account](#exporting-your-dex-trading-account)(**Step 1 and 2**).
+2. On the selected DEX account settings page, click on the `Disable Account`.
+3. Confirm the action with your app password.
+
+If successful, the DEX trading account **will not be listed until it is added again**.
+
+**Note**: Keep in mind that you can't disable your account if you have active
+orders or unspent bonds.
+
+## Re-enabling a DEX Trading Account
+
+If you disabled your account but want to re-enable it:
+
+1. Go to the `Settings` page.
+2. Click on `Add a DEX`.
+
+    <img src="./images/add-dex-account.png" width="300">
+
+3. Choose the DEX host you previously disabled. You can click on a pre-defined
+   host or enter the address of the host after clicking on the `add a different
+   server` button.
+
+    <img src="images/add-dex-reg.png" width="320">
+
+Your old account will be automatically discovered and enabled.
+
+**Note**: Remember, after re-enabling, you'll need to create fidelity bonds to
+use your account again.
+
+## Managing your DEX Trading Account Tier
+
+To manage your DEX trading account tier, here's what you need to do:
+
+1. Visit the DEX account settings as in [Exporting your DEX Trading Account](#exporting-your-dex-trading-account)(**Step 1 and 2**).
+2. On the DEX account settings page, click `Update Bond Options`.
+3. Choose the asset for your fidelity bonds and set your `Target Tier`.
+4. Click `Submit` to update your bond options.
+
+**Note**: Make sure you have enough funds to cover your desired `Target Tier`.
+
+## Wrapping Up
+
+That's it! You've learned how to manage your DEX Trading Account.
+
+While this guide covers the basics, there are more advanced topics like updating
+DEX hosts and TLS certificates. But for now, you're ready to dive into the
+exciting world of DEX trading!
+
+## Glossary
+
+- **Fidelity Bonds**: These are locked funds redeemable by you in the future.
+They help prevent disruptive behavior in trades like backing out on swaps.
+- **Target Tier**: This is the target account tier you wish to maintain.
+Set to zero if you wish to disable tier maintenance (i.e do not post new bonds).