Huge release

Main items

Browser steps - Interact with the browser, login to websites, accept cookie boxes, fill forms, click X,Y and more (requires playwright), runs before changedetection so you can log into a website and then get a change alert
Auto suggestion to follow product LD JSON data use existing product data to get better price change alerts without needing visual-filter/xpath/css selectors (where the website supports LD-JSON)
Dark Mode - Thanks to @tanc for the killer styling and functionality!
Notifications , Improved simple gets:// post:// callbacks and Jinja2 compatible templates, all variables, tokens now available in notification settings (you could even put if statements in your notification body if you wanted, as an idea)
Extract historical data, Use a regex to generate CSV files (great for scraping websites over time, for example the number of available houses for rent/buy over time)
Loads of fixes

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What's Changed

Update README.md by @t5k6 in #1158
Configurable browser steps (enter text, scroll, wait for text, etc) by @dgtlmoon in #478
Extra validation for URLs with jinja2 template by @dgtlmoon in #1166
Faster BrowserStep screenshot updates and enable gzip compression for all content replies in the UI by @dgtlmoon in #1171
BrowserSteps - Make the UI require an extra step so it doesnt slow down the experience when clicking through the tabs by @dgtlmoon in #1175
Favicon multiplatform update by @dgtlmoon in #1176
add changedetection container dependencies by @peppetemp in #1178
Simple extract data by regex from all historical watch text by @dgtlmoon in #1191
Extra validation for regex extract field by @dgtlmoon in #1192
test fix - use local address by @dgtlmoon in #1193
Notifications - tokens/jinja2 templating by @dgtlmoon in #1184
Notification - Support for standard API calls post:// posts:// get:// gets:// delete:// deletes:// put:// puts:// by @dgtlmoon in #1194
Dark mode - Template tidy up by @dgtlmoon in #1197
Update runtime.txt to work on all heroku stacks by @amrohendawi in #1198
Test cleanups by @dgtlmoon in #1196

Full Changelog: 0.39.22.1...0.40.0