add lemon squeezy as payment provider (#246)

* add lemon squeezy checkout and webhook

* add lemonSqueezy customer portal url

* Update AccountPage.tsx

* add lemon squeezy total revenue function

* update app diff

* update app diff

* add LS docs

* Update PricingPage.tsx

* add unified payment processor

* unify customer portal url

* Update paymentProcessor.ts

* update paymentProcessor logic

* update app diff to use both payments processors

* Update contentSections.ts.diff

* finishing touches

* Update e2e-tests.yml

* remove lemonsqueezy from app diff

* Update webhook.ts

opensaas-sh/app_diff/src/landing-page/contentSections.ts.diff

@@ -44,10 +44,10 @@
    {
 -    name: 'Cool Feature #4',
 -    description: 'Describe your cool feature here.',
-+    name: 'Stripe Integration',
-+    description: "No SaaS is complete without payments. That's why payments and the necessary webhooks are built-in.",
++    name: 'Stripe / Lemon Squeezy Integration',
++    description: "No SaaS is complete without payments. We've pre-configured checkout and webhooks. Just choose a provider and start cashing out.",
      icon: '💸',
-+    href: DocsUrl + '/guides/stripe-integration/',
++    href: DocsUrl + '/guides/payments-integration/',
 +  },
 +  {
 +    name: 'Admin Dashboard',