Add vision pipeline diagram to documentation (#7689)

* Add vision pipeline diagram

* Moved pipeline to the Guides section

* Fixing segment storage and other flows

* Added text

* Update docs/docs/guides/video_pipeline.md

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Keeping case as other pages

* Changing sections to ##

* Update docs/docs/guides/video_pipeline.md

Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

* Update docs/docs/guides/video_pipeline.md

Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

---------

Co-authored-by: cat101 <cat101@nowhere.com>
Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>
Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

docs/docusaurus.config.js

@@ -10,7 +10,11 @@ module.exports = {
   favicon: 'img/favicon.ico',
   organizationName: 'blakeblackshear',
   projectName: 'frigate',
-  themeConfig: {
+  markdown: {
+    mermaid: true,
+  },
+  themes: ['@docusaurus/theme-mermaid'],
+  themeConfig: {  
     algolia: {
       appId: 'WIURGBNBPY',
       apiKey: 'd02cc0a6a61178b25da550212925226b',