Replace tables by mobile-friendly flexbox in list with pagination

[smirolo]

There are <table> elements in the following templates that most likely must be replaced:

• djaoapp/templates/saas/profile/subscriptions.html (Subscriptions page: rewrite to use tabs instead of 2 tables #104)
• djaoapp/templates/saas/profile/subscribers.html
• djaoapp/templates/saas/profile/plans/subscribers.html
• djaoapp/templates/saas/_invoiceables.html
• djaoapp/templates/saas/billing/receipt.html
• djaoapp/templates/saas/metrics/coupons.html
• djaoapp/templates/saas/metrics/dashboard.html
• djaoapp/templates/saas/profile/plans/index.html
• djaoapp/templates/saas/profile/roles/index.html

There are <table> elements in the following templates that may be be replaced:

• djaoapp/templates/rules/app_dashboard.html
• djaoapp/templates/rules/engagement.html
• djaoapp/templates/saas/_transactions.html
• djaoapp/templates/saas/billing/transactions.html
• djaoapp/templates/saas/metrics/balances.html
• djaoapp/templates/saas/metrics/base.html