Initial rebrand from paritytech/subxt to pezkuwichain/pezkuwi-subxt

- Renamed all subxt crates to pezkuwi-subxt
- Updated internal references
- Configured for Pezkuwi ecosystem

.github/workflows/actions/use-nodes/README.md

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+# use-nodes
+
+This action downloads the substrate and polkadot binaries produced from the `build-nodes` workflow and puts them into the `$PATH`.

.github/workflows/actions/use-nodes/action.yml

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+name: Use substrate and polkadot binaries
+description: Downloads and configures the substrate and polkadot binaries built with `build-nodes`
+runs:
+  using: composite
+  steps:
+    - name: Install dependencies
+      shell: bash
+      run: sudo apt-get update && sudo apt-get install -y curl gcc make clang cmake
+
+    - name: Download substrate-node binary
+      id: download-substrate-binary
+      uses: dawidd6/action-download-artifact@4c1e823582f43b179e2cbb49c3eade4e41f992e2 # v10
+      with:
+        workflow: build-nodes.yml
+        name: nightly-substrate-binary
+
+    - name: Download polkadot binary
+      id: download-polkadot-binary
+      uses: dawidd6/action-download-artifact@4c1e823582f43b179e2cbb49c3eade4e41f992e2 # v10
+      with:
+        workflow: build-nodes.yml
+        name: nightly-polkadot-binary
+
+    - name: decompress polkadot binary
+      shell: bash
+      run: |
+        tar -xzvf ./polkadot.tar.gz
+        cp ./target/release/polkadot ./polkadot
+
+    - name: Prepare binaries
+      shell: bash
+      run: |
+        chmod u+x ./substrate-node
+        chmod u+x ./polkadot
+        chmod u+x ./polkadot-execute-worker
+        chmod u+x ./polkadot-prepare-worker
+        ./substrate-node --version
+        ./polkadot --version
+        sudo mv ./substrate-node /usr/local/bin
+        sudo mv ./polkadot /usr/local/bin
+        sudo mv ./polkadot-execute-worker /usr/local/bin
+        sudo mv ./polkadot-prepare-worker /usr/local/bin
+        rm ./polkadot.tar.gz