📦 Dependency Updates (& convert to Bun & ESM)

[mountainash]

• using Bun for engine & package manager (in local dev and CI)
• removed Babel (isn't needed)
• updated to ESM
• removed Axios in favour of fetch
• using native atob & btoa
• optimising builds for latest Chrome
• svg fixes

Should be easier to move to Extensions Manifest v3 as it's more inline with what can run in a Web Worker

[dougppaz]

great job @mountainash :D