docs: update docs

docs/audio.rst

@@ -1,2 +1,51 @@
 Audio Captcha
 =============
+
+.. rst-class:: lead
+
+    Unlock security with Audio CAPTCHA aastery.
+
+----
+
+.. module:: captcha.audio
+    :noindex:
+
+Usage
+-----
+
+Generating audio CAPTCHA with the :class:`AudioCaptcha`` class is remarkably simple.
+
+.. code-block:: python
+
+    from captcha.audio import AudioCaptcha
+
+    captcha = AudioCaptcha()
+    data: bytearray = captcha.generate('1234')
+
+.. note::
+
+    The default voice library only includes numbers from 0 to 9.
+
+Voice library
+-------------
+
+We can build our customized voice library with the help of ``espeak`` and ``ffmpeg``:
+
+.. code-block:: bash
+
+  # Set the language code
+  export ESLANG=en
+
+  # Create a directory for the specified language code
+  mkdir "$ESLANG"
+
+  # Loop through each character (a-z, A-Z, 0-9) and create a directory for each
+  for i in {a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,0,1,2,3,4,5,6,7,8,9}; do
+      mkdir "$ESLANG/$i"
+      espeak -a 150 -s 100 -p 15 -v "$ESLANG" "$i" -w "$ESLANG/$i/orig_default.wav"
+      ffmpeg -i "$ESLANG/$i/orig_default.wav" -ar 8000 -ac 1 -acodec pcm_u8 "$ESLANG/$i/default.wav"
+      rm "$ESLANG/$i/orig_default.wav"
+  done
+
+Web server
+----------

docs/conf.py

@@ -58,6 +58,12 @@ html_theme_options = {
     'github_url': 'https://github.com/lepture/captcha',
     "carbon_ads_code": "CE7DKK3W",
     "carbon_ads_placement": "captchalepturecom",
+    "light_css_variables": {
+        "--sy-rc-theme": "36, 206, 114",
+    },
+    "dark_css_variables": {
+        "--sy-rc-theme": "36, 179, 101",
+    },
     "nav_links": [
         {"title": "Sponsor me", "url": "https://github.com/sponsors/lepture"},
     ]

docs/image.rst

@@ -1,2 +1,31 @@
 Image Captcha
 =============
+
+.. rst-class:: lead
+
+    Unleash captivating security with image CAPTCHA mastery.
+
+----
+
+.. module:: captcha.image
+    :noindex:
+
+Usage
+-----
+
+Generating image CAPTCHA with the :class:`ImageCaptcha` class is incredibly straightforward.
+
+
+.. code-block:: python
+
+    from io import BytesIO
+    from captcha.image import ImageCaptcha
+
+    captcha = ImageCaptcha()
+    data: BytesIO = captcha.generate('ABCD')
+
+Fonts
+-----
+
+Web server
+----------