Improve the startup article

[boobo94]

• [x] https://github.com/mmccaff/PlacesToPostYourStartup
• [x] https://friendsofsaas.substack.com/p/as-it-turns-out-this-is-what-vcs
• [x] https://www.indiehackers.com/post/customer-acquisition-cost-for-saas-6c7af2bba2
• [x] https://www.indiehackers.com/post/7-user-engagement-tools-how-they-help-you-to-grow-your-business-7e010b4fa7
• [x] https://friendsofsaas.substack.com/p/where-to-find-ideas
• [x] https://friendsofsaas.substack.com/p/saas-branding
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