Fix update of starter pack records

[patcon]

Addresses #16

This should work!

[jaseemabid]

I'm not sure if this is actually needed since it works fine for me without. These are the values I have btw.

export STARTER_PACK_URI='at://did:plc:r2klcx26ygxty7yprmbtd7b5/app.bsky.graph.list/3lagxhsxcma2e'
export LIST_URI='at://did:plc:r2klcx26ygxty7yprmbtd7b5/app.bsky.graph.list/3lawghh5a6v2c'

Maybe your URI is pointing to the top level starter pack and not the list inside it? Will have to dig a bit more into the details later to be sure.

[patcon]

ah yes, i pointed it to the starter pack uri, which is what is visible in the url, and most easily discoverable for setup

what if i parsed for app.bsky.graph.starterpack in the uri instead?

Sorry, I am def submitting PRs as if you're open to this being used by others as a general tool, and want a good experience for users in that situation. but if this isn't up you alley, i can just create a "detached fork" (forks don't show up easily in search, and so aren't geared toward being standalone projects)

[patcon]

K, handling this more generally now. Lemme know if it works for you :)

[patcon]

To be clear, this PR allows starter packs to be specified more conveniently from looking at the web url:

#export STARTER_PACK_URI='at://did:plc:r2klcx26ygxty7yprmbtd7b5/app.bsky.graph.list/3lagxhsxcma2e'
export LIST_URI='at://did:plc:r2klcx26ygxty7yprmbtd7b5/app.bsky.graph.list/3lawghh5a6v2c'

# Source starter pack -->  https://bsky.app/starter-pack/jabid.in/3lagxhtghxi2e
export STARTER_PACK_URI='at://jabid.in/app.bsky.graph.starterpack/3lagxhtghxi2e'

note the last at-uri part matching the source web url, and the non-requirement of figuring out the DID

Disclaimer: For some reason, unlike get_starter_pack, get_list doesn't allow the handle-style at-uri as the scheme spec says it should, only the DID-style. I'm filing a bug for that upstream, and will link it here after, for context.

A DID-style at-uri is supposed to be the more permanent and recommended option (to persist beyond handle changes), but shouldn't be required.

[patcon]

Added some docs too, so it's clear which values will work. Should I add sample values to show that sub-list uri's work for starter packs, or is that just kinda tedium now (since not required)?