chore: Update Pyth Oracle Example Program (#375)

* chore: remove non-functioning Pyth Oracle Anchor program

The SDK version used in the example is no longer supported and
relies on the legacy Push Oracle, which has been decommissioned.

Removing it to ensure the examples remain accurate and functional.

* feat: add new Pyth Oracle example

* chore: update program name and meta information

The original Pyth Oracle example program has backlinks from external
sites. Rename the new example program to `pythexample` so the
directory structure and GitHub URL remain the same so we hopefully
don't break links on external sites.

* chore: migrate from Yarn to pnpm as per contributing guide

* chore: remove unused files and configs

Project no longer uses the Anchor client or any other TypeScript
code/packages. Clean up related obsolete files.

Author: aaronbassett

oracles/pyth/anchor/.gitignore

@@ -1,7 +1,5 @@
-
 .anchor
 .DS_Store
 target
 **/*.rs.bk
-node_modules
 test-ledger

oracles/pyth/anchor/.prettierignore

@@ -1,21 +1,15 @@
+[toolchain]
+
 [features]
-seeds = false
+resolution = true
 skip-lint = false
+
 [programs.localnet]
-pythexample = "F6mNuN1xoPdRaZcUX3Xviq7x1EFtoBXygpFggCLd62eU"
+pythexample = "GUkjQmrLPFXXNK1bFLKt8XQi6g3TjxcHVspbjDoHvMG2"
 
 [registry]
 url = "https://api.apr.dev"
 
 [provider]
 cluster = "Localnet"
-wallet = "~/.config/solana/id.json"
-
-[scripts]
-test = "pnpm ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"
-
-[test.validator]
-url = "https://api.mainnet-beta.solana.com"
-
-[[test.validator.clone]]
-address = "H6ARHf6YXhGYeQfUzQNGk6rDNnLBQKrenN712K4AQJEG"
+wallet = "~/.config/solana/id.json"