Add docs navigation and tighten API request security

docs/gitbook/accounts.md

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+# Accounts and appearance
+
+An account lets you host parties, keep your maps, and return to your support conversations.
+
+## Sign in
+
+Click **Log in** in the header. From there you can sign in, create an account, or recover a forgotten password. Once signed in, the button becomes **My account**.
+
+Your account page lists your maps and recent games. Open **Account settings** to change your name or password.
+
+## Change your name
+
+1. Open **My account → Account settings**.
+2. Find **Display name**.
+3. Enter a name between 2 and 32 characters.
+4. Click **Save display name**.
+
+This is the name people see in multiplayer and map credits. More than one player can have the same name. You still sign in using your email address.
+
+## Choose light or dark mode
+
+Click the sun/moon button in the header or footer. No account is needed. Your browser remembers the choice when it can. The actual map pictures keep their colors.
+
+To change the site language, use **Site language** at the bottom of the page and choose English, Русский, or Automatic.
+
+## Change a glow color
+
+If support has awarded you a username glow, open **Settings → Username glow**, choose a color, and click **Save glow color**. This option needs an active glow reward.
+
+## Forgot your password?
+
+Use password recovery on the login page and follow the email. If the link expires, request a new one. New passwords need at least 12 characters; the page will explain any other requirements.
+
+Never share your password or recovery email link with another player.