Update README.md - fix indent and link markup

Update README.md - readability

build installer based on OpenWrt 24.10.0

Add zstd to dependencies in readme

Update build key to "Universal GPG signing key from Nitrokey 3A key"

trigger crash if installer cannot proceed

Revert "build and provide bl2-for-mtk_uartboot.bin"

Replace xz with zst for downloads

also build bl2 image for debugging issue

build and provide bl2-for-mtk_uartboot.bin

fitblk was moved to target default packages

make sure fitblk is included in recovery image

remove complete backup procedure

explicitely -> explicitly

update README.md