feat: add Biel.AI AI assistant widget (apify#1867)

Alternative to apify#1866 . Keeps Algolia as the main search provider, but
adds a small AI chatbot widget in the bottom right corner.

<img width="2095" height="1258" alt="image"
src="https://github.com/user-attachments/assets/56ee52ba-81e9-4d38-b3f2-a79184d636ce"
/>

Closes apify#1866

Author: barjin

apify-docs-theme/src/theme/custom.css

@@ -125,6 +125,8 @@ html[data-theme='dark'] {
 }
 
 :root {
+    --biel-button-position-right: 84px;
+    --biel-button-position-bottom: 24px;
     /* use default system font based on https://devhints.io/css-system-font-stack */
     --ifm-font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI',
         'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans',
@@ -1997,3 +1999,4 @@ div[class^="navbarSearchContainer"] {
     width: 14px !important;
     height: 15px !important;
 }
+

docusaurus.config.js

@@ -131,6 +131,13 @@ module.exports = {
         ],
     ]),
     plugins: [
+        [
+            'docusaurus-biel', {
+                project: 'zat23cvkm1',
+                headerTitle: 'Biel.ai chatbot',
+                version: 'latest',
+            },
+        ],
         'docusaurus-plugin-image-zoom',
         [
             '@docusaurus/plugin-content-docs',

package-lock.json

@@ -82,6 +82,7 @@
         "@signalwire/docusaurus-plugin-llms-txt": "^1.2.1",
         "ajv": "^8.17.1",
         "clsx": "^2.0.0",
+        "docusaurus-biel": "^1.0.8",
         "docusaurus-plugin-image-zoom": "^3.0.1",
         "docusaurus-plugin-openapi-docs": "^4.3.7",
         "docusaurus-theme-openapi-docs": "^4.3.7",