Speedrun mode

[wilsonehusin]

Inspired by folks at Fly.io, I think we should add speedrun mode, particularly in the README / guides. I imagine it's something like:

bindl init
bindl add github:google/ko
bindl sync
bindl get ko

Which, kind of have some pre-requisites to be filled before such thing can be added to documentation.

As a start, I think something like this is acceptable too:

curl --location --remote-name https://bindl.dev/examples/bindl.yaml
bindl sync && bindl get

Would be great if the example manifest contains variations of:

• programs using different providers
• specifically overridden checksums.txt
• releases with signatures