Add simple documentation of audio-only rooms (#104)

## Description

Closes FCE-1327

Adding basic documentation of what the benefits of using audio-only
rooms are and how to use them.

Author: AHGIJMKLKKZNPJKQR

.spelling

@@ -31,8 +31,6 @@ Xcode
 UI
 dev
 Podfile
-2.0
-2012
 TLDR
 frontend
 quicknavigation
@@ -43,7 +41,6 @@ item.title.tolowercase
 videoroom
 fishjam.io
 room.fishjam.io
-24
 unmuting
 programmatically
 unmute

docs/audio-calls.mdx

@@ -0,0 +1,54 @@
+---
+sidebar_position: 5
+---
+
+import Tabs from "@theme/Tabs";
+import TabItem from "@theme/TabItem";
+
+# Audio-only Calls
+
+In many use cases, you only need real-time audio, without any video streaming.
+If your use case falls into this category, then you can benefit greatly from using `audio_only` rooms in Fishjam.
+
+<!-- TODO(Tomasz Mazur): uncomment this once pricing page is ready -->
+<!-- ## Why Should I Care? -->
+<!---->
+<!-- Audio-only rooms are heavily discounted compared to normal rooms. -->
+<!-- As described in more detail on the [pricing page](https://fishjam.io/#pricing), Fishjam rooms are priced based on the total connection time of peers in them. -->
+<!-- Audio-only rooms come at a 75% discount. -->
+<!-- For example, if you have a normal room with 2 peers connected for 30 minutes, then the total cost of the room will be equal to the cost of 60 minutes. -->
+<!-- If the same room were audio-only, then the final cost of the room will only be equal to 15 minutes. -->
+
+## How Do I Use It?
+
+Using this feature is as easy as setting the `roomType` field to `audio_only` when creating a room using our [Server SDKs](/production/server)
+
+<Tabs groupId="language">
+  <TabItem value="ts" label="Typescript">
+  
+    ```ts
+    const createdRoom = await fishjamClient.createRoom({ roomType: 'audio_only' });
+    ```
+
+  </TabItem>
+
+  <TabItem value="python" label="Python">
+
+    ```python
+    options = RoomOptions(room_type="audio_only")
+    created_room = fishjam_client.create_room()
+    ```
+
+  </TabItem>
+ </Tabs>
+
+Now, you can connect peers normally to the room as described in our [React Native](/react-native/connecting) and [React](/react/connecting) docs.
+
+:::info
+The React Native and React SDKs will log a warning in the console if any attempt to add video to an audio-only room is made.
+This aims to assist in debugging, as adding video to an audio-only room does nothing and is most likely a mistake.
+:::
+
+### Screen sharing
+
+If you attempt to screen share when connected to an `audio_only` room, then only the audio will actually be sent to the other peers.

docs/production/_category_.json

@@ -1,6 +1,6 @@
 {
   "label": "Going to production",
-  "position": 6,
+  "position": 7,
   "link": {
     "type": "generated-index"
   }

package.json

@@ -17,7 +17,7 @@
     "typecheck": "tsc",
     "format": "prettier . --write",
     "format:check": "prettier . --check",
-    "spellcheck": "mdspell '**/*.md' '**/*.mdx' '!node_modules/**' '!packages/**' '!docs/api/**' --en-us",
+    "spellcheck": "mdspell '**/*.md' '**/*.mdx' '!node_modules/**' '!packages/**' '!docs/api/**' --en-us --ignore-numbers",
     "spellcheck:report": "yarn spellcheck -r"
   },
   "dependencies": {
@@ -57,4 +57,4 @@
     "node": ">=18.0"
   },
   "packageManager": "yarn@4.5.3"
-}
+}