docs: fix broken external links in snapshots and blobstream pages (#2430)

* docs: fix broken external links in snapshots and blobstream docs

* docs: keep qubelabs snapshot links and skip flaky endpoint in checker

* docs: keep arbiscan links and skip bot-blocked explorer domains

Author: jcstein

app/build/blobstream/integrate-contracts/page.mdx

@@ -120,4 +120,4 @@ the following chains:
 | SP1 Blobstream | Arbitrum Sepolia       | [`0xc3e209eb245Fd59c8586777b499d6A665DF3ABD2`](https://sepolia.arbiscan.io/address/0xc3e209eb245Fd59c8586777b499d6A665DF3ABD2#events)            | [Mocha testnet](/operate/networks/mocha-testnet) | [Deployment on Celenium](https://mocha.celenium.io/blobstream?network=arbitrum&page=1) |
 | SP1 Blobstream | Base Sepolia           | [`0xc3e209eb245Fd59c8586777b499d6A665DF3ABD2`](https://sepolia.basescan.org/address/0xc3e209eb245Fd59c8586777b499d6A665DF3ABD2#events)           | [Mocha testnet](/operate/networks/mocha-testnet) | [Deployment on Celenium](https://mocha.celenium.io/blobstream?network=base&page=1)     |
 | SP1 Blobstream | Holesky                | [`0x315A044cb95e4d44bBf6253585FbEbcdB6fb41ef`](https://holesky.etherscan.io/address/0x315A044cb95e4d44bBf6253585FbEbcdB6fb41ef)                  | [Mocha testnet](/operate/networks/mocha-testnet) | N/A                                                                                    |
-| SP1 Blobstream | ZKSync Gateway Staging | [`0x3a038D77A9b4eBBc8A7482B438BCff11c3591792`](https://explorer.era-gateway-stage.zksync.dev/address/0x3a038D77A9b4eBBc8A7482B438BCff11c3591792) | [Mocha testnet](/operate/networks/mocha-testnet) | N/A                                                                                    |
+| SP1 Blobstream | ZKSync Gateway Staging | [`0x3a038D77A9b4eBBc8A7482B438BCff11c3591792`](https://explorer.era-gateway-stage.zksync.dev/address/0x3a038D77A9b4eBBc8A7482B438BCff11c3591792) | [Mocha testnet](/operate/networks/mocha-testnet) | N/A                                                                                    |

scripts/check-links.mjs

@@ -47,6 +47,8 @@ const DEFAULT_SKIP_PATTERNS = [
   'validao.xyz', // Community node map visualization
   'celestia.valopers.com', // Community explorer
   'holesky.etherscan.io', // Testnet Etherscan (can be flaky)
+  'arbiscan.io', // Cloudflare challenge blocks automated checks
+  'sepolia.arbiscan.io', // Cloudflare challenge blocks automated checks
   'hibachi.xyz',
   'figment.io/',
   // Package registries and academic resources
@@ -55,6 +57,7 @@ const DEFAULT_SKIP_PATTERNS = [
   // Snapshot providers
   'polkachu.com/tendermint_snapshots/celestia',
   'polkachu.com/testnets/celestia/snapshots',
+  'snaps.qubelabs.io/celestia',
 ];
 
 // Patterns that should only fail on 404 errors