Support for git hosts other than github (#407)

* Update repository list file

* Add host part to repo name

* Allow git hosts other than github

app/data/stacks/fixturenet-optimism/l2-only.md

@@ -9,7 +9,7 @@ Prerequisite: An L1 Ethereum RPC endpoint
 Clone required repositories:
 
 ```bash
-laconic-so --stack fixturenet-optimism setup-repositories --exclude cerc-io/go-ethereum
+laconic-so --stack fixturenet-optimism setup-repositories --exclude github.com/cerc-io/go-ethereum
 
 # If this throws an error as a result of being already checked out to a branch/tag in a repo, remove the repositories mentioned below and re-run the command
 ```

app/data/stacks/fixturenet-optimism/stack.yml

@@ -2,10 +2,10 @@ version: "1.0"
 name: fixturenet-optimism
 decription: "Optimism Fixturenet"
 repos:
-  - cerc-io/go-ethereum
-  - dboreham/foundry
-  - ethereum-optimism/optimism
-  - ethereum-optimism/op-geth
+  - github.com/cerc-io/go-ethereum
+  - github.com/dboreham/foundry
+  - github.com/ethereum-optimism/optimism
+  - github.com/ethereum-optimism/op-geth
 containers:
   - cerc/go-ethereum
   - cerc/lighthouse