Remove the unused website and clean other dependencies (#8362)

## Summary

Remove the new and unused benchmark from the repo. Also took the
opportunity to clean up some other dependencies.

---------

Signed-off-by: Adam Gutglick <adam@spiraldb.com>

Author: AdamGS

.github/workflows/ci.yml

@@ -330,7 +330,7 @@ jobs:
         if: matrix.os == 'windows-x64'
         run: |
           cargo nextest run --cargo-profile ci --locked --workspace --all-features --no-fail-fast `
-            --exclude vortex-bench --exclude vortex-bench-server `
+            --exclude vortex-bench `
             --exclude vortex-python --exclude vortex-duckdb `
             --exclude vortex-fuzz --exclude vortex-cuda --exclude vortex-cuda-ffi `
             --exclude vortex-nvcomp --exclude vortex-cub --exclude vortex-test-e2e-cuda `
@@ -342,19 +342,6 @@ jobs:
         if: matrix.os != 'windows-x64'
         run: |
           cargo nextest run --cargo-profile ci --locked --workspace --all-features --no-fail-fast --exclude vortex-bench --exclude xtask --exclude vortex-sqllogictest
-      - name: vortex-bench-server admin snapshot tests (Linux only - network-dependent)
-        # The /api/admin/snapshot tests INSTALL+LOAD the vortex DuckDB
-        # core extension from extensions.duckdb.org on first call. They
-        # are #[ignore]'d by default so `cargo test` works in offline
-        # environments (sandboxed CI, local dev without network). This
-        # step runs them explicitly on the Linux runners, which DO have
-        # outbound network, so the entire backup contract is covered
-        # in CI before merge. macOS/arm64 also exercises them - same
-        # extension, same network. Windows skipped (bench-server is
-        # excluded from Windows test matrix above).
-        if: matrix.os == 'linux-x64' || matrix.os == 'linux-arm64' || matrix.os == 'macos-arm64'
-        run: |
-          cargo nextest run --cargo-profile ci --locked -p vortex-bench-server --test admin --run-ignored only
       - uses: ./.github/actions/check-rebuild
         if: matrix.os != 'windows-x64'
         with:

.github/workflows/rust-instrumented.yml

@@ -144,8 +144,8 @@ jobs:
       - name: Run tests with sanitizer
         run: |
           RUSTFLAGS="${RUSTFLAGS} ${{ matrix.sanitizer_flags }}" \
-          cargo +$NIGHTLY_TOOLCHAIN nextest run --locked --all-features \
-            --target x86_64-unknown-linux-gnu --no-fail-fast -Zbuild-std \
+          cargo +$NIGHTLY_TOOLCHAIN nextest run --locked --all-features --no-fail-fast \
+            --target x86_64-unknown-linux-gnu -Zbuild-std \
             -p vortex-buffer -p vortex-fastlanes -p vortex-fsst -p vortex-alp -p vortex-array
 
         # vortex-ffi requires --no-default-features as otherwise we pull in