chore: move "install.sh" script into "scripts" dir (#2719)

# What does this PR do?
"install.sh" is something that a general user might not use e.g. it is
specific to using the "ollama" inference provider

cleanup the top-level structure of the repo by moving it into the
"scripts" dir and updating the relevant references accordingly

Signed-off-by: Nathan Weinberg <nweinber@redhat.com>

.github/workflows/install-script-ci.yml

@@ -3,10 +3,10 @@ name: Installer CI
 on:
   pull_request:
     paths:
-      - 'install.sh'
+      - 'scripts/install.sh'
   push:
     paths:
-      - 'install.sh'
+      - 'scripts/install.sh'
   schedule:
     - cron: '0 2 * * *'  # every day at 02:00 UTC
 
@@ -16,11 +16,11 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
       - name: Run ShellCheck on install.sh
-        run: shellcheck install.sh
+        run: shellcheck scripts/install.sh
   smoke-test:
     needs: lint
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
       - name: Run installer end-to-end
-        run: ./install.sh
+        run: ./scripts/install.sh

README.md

@@ -77,7 +77,7 @@ As more providers start supporting Llama 4, you can use them in Llama Stack as w
 To try Llama Stack locally, run:
 
 ```bash
-curl -LsSf https://github.com/meta-llama/llama-stack/raw/main/install.sh | bash
+curl -LsSf https://github.com/meta-llama/llama-stack/raw/main/scripts/install.sh | bash
 ```
 
 ### Overview