Update README with local port environment variable

Merge pull request #3 from WildEchoWanderer/main

Change frontend port to use environment variable

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feat: update PWA icons and app logo with transparent version, adjust component styling

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docs: enhance readme with badges, screenshot, and hosting info

feat: add github oauth and prepare for public release

perf: optimize account deletion with server-side hook

fix: clear recharts console warnings by adding minWidth to containers

perf: optimize scenario creation and category deletion with batching

fix: enable pocketbase batch api and fix deprecated meta tags

perf: optimize budget save by using PocketBase batch requests

docs: update footer links for privacy, terms, and imprint