* Remove optimizely, as it isn't being used anymore from the frontend codebase
* Remove optimizely references form netlify config, vercel config, index.html, docker script, nginx templates and example .env file
* temp commit
* using onsubmit to continue using action on form
* added recaptcha site key to env example file
* moved the recaptcha lib loading logic to signup page
* removed unnecessary edit
* handle the case where the recaptcha token is not provided as env var
* added proper env var config for client
* recaptcha config for ansible
* recaptcha config for heroku
* recaptcha config for k8s
* updated app.json
* fixed the typos
* added more description for env vars
* removed api key
* minor typo fix
