docs: Add minimap configuration section (#30724)

This PR adds some documentation about the minimap to the official docs.

**Please note:** The [current preview release
notes](https://zed.dev/releases/preview/0.187.0) refer to the minimap PR
for configuration options. However, `font_size` and `width` were removed
as settings after some discussion but are still referenced in the PR
description, which might be misleading. On the other hand, some of the
available configuration options are not listed in the PR description. It
might be better to refer to the docs or the default settings in order to
avoid confusion.

Release Notes:

- N/A

docs/src/configuring-zed.md

@@ -831,6 +831,185 @@ List of `string` values
 
 `boolean` values
 
+## Minimap
+
+- Description: Settings related to the editor's minimap, which provides an overview of your document.
+- Setting: `minimap`
+- Default:
+
+```json
+{
+  "minimap": {
+    "show": "never",
+    "thumb": "always",
+    "thumb_border": "left_open",
+    "current_line_highlight": null
+  }
+}
+```
+
+### Show Mode
+
+- Description: When to show the minimap in the editor.
+- Setting: `show`
+- Default: `never`
+
+**Options**
+
+1. Always show the minimap:
+
+```json
+{
+  "show": "always"
+}
+```
+
+2. Show the minimap if the editor's scrollbars are visible:
+
+```json
+{
+  "show": "auto"
+}
+```
+
+3. Never show the minimap:
+
+```json
+{
+  "show": "never"
+}
+```
+
+### Thumb Display
+
+- Description: When to show the minimap thumb (the visible editor area) in the minimap.
+- Setting: `thumb`
+- Default: `always`
+
+**Options**
+
+1. Show the minimap thumb when hovering over the minimap:
+
+```json
+{
+  "thumb": "hover"
+}
+```
+
+2. Always show the minimap thumb:
+
+```json
+{
+  "thumb": "always"
+}
+```
+
+### Thumb Border
+
+- Description: How the minimap thumb border should look.
+- Setting: `thumb_border`
+- Default: `left_open`
+
+**Options**
+
+1. Display a border on all sides of the thumb:
+
+```json
+{
+  "thumb_border": "full"
+}
+```
+
+2. Display a border on all sides except the left side:
+
+```json
+{
+  "thumb_border": "left_open"
+}
+```
+
+3. Display a border on all sides except the right side:
+
+```json
+{
+  "thumb_border": "right_open"
+}
+```
+
+4. Display a border only on the left side:
+
+```json
+{
+  "thumb_border": "left_only"
+}
+```
+
+5. Display the thumb without any border:
+
+```json
+{
+  "thumb_border": "none"
+}
+```
+
+### Current Line Highlight
+
+- Description: How to highlight the current line in the minimap.
+- Setting: `current_line_highlight`
+- Default: `null`
+
+**Options**
+
+1. Inherit the editor's current line highlight setting:
+
+```json
+{
+  "minimap": {
+    "current_line_highlight": null
+  }
+}
+```
+
+2. Highlight the current line in the minimap:
+
+```json
+{
+  "minimap": {
+    "current_line_highlight": "line"
+  }
+}
+```
+
+or
+
+```json
+{
+  "minimap": {
+    "current_line_highlight": "all"
+  }
+}
+```
+
+3. Do not highlight the current line in the minimap:
+
+```json
+{
+  "minimap": {
+    "current_line_highlight": "gutter"
+  }
+}
+```
+
+or
+
+```json
+{
+  "minimap": {
+    "current_line_highlight": "none"
+  }
+}
+```
+
 ## Editor Tab Bar
 
 - Description: Settings related to the editor's tab bar.