Move predeploy-contracts into ./blockchain

Move predeploy-contracts into `./blockchain`

.gitmodules

@@ -1,7 +1,3 @@
-[submodule "predeploy-contracts"]
-	path = blockchain/submodules/predeploy-contracts
-	url = https://github.com/Setheum-Labs/predeploy-contracts.git
-
 [submodule "orml"]
 	path = orml
 	url = https://github.com/Slixon-Technologies/open-runtime-module-library.git

Makefile

@@ -125,4 +125,4 @@ endif
 .PHONY: generate-tokens
 generate-tokens:
 	cargo test -p setheum-primitives -- --ignored
-	cd blockchain/submodules/predeploy-contracts && yarn && yarn run generate-bytecode
+	cd blockchain/predeploy-contracts && yarn && yarn run generate-bytecode

README.md

@@ -116,7 +116,7 @@ sudo apt-get install -y git make clang curl pkg-config libssl-dev llvm libudev-d
 
 You may need additional dependencies, checkout [substrate.io](https://docs.substrate.io/v3/getting-started/installation) for more info.
 
-Make sure you have `submodule.recurse` set to true to configure submodules.
+Make sure you have `submodule.recurse` set to true to ease submodule use.
 
 ```bash
 git config --global submodule.recurse true
@@ -210,12 +210,6 @@ Update Cargo:
 make update
 ```
 
-Update Submodules:
-
-```bash
-make update-submodules
-```
-
 Update ORML:
 
 ```bash
@@ -224,14 +218,6 @@ git add orml
 cargo update check-all
 ```
 
-Update Predeploy-Contracts:
-
-```bash
-cd blockchain/submodules/predeploy-contracts && git checkout master && git pull
-git add predeploy-contracts
-cargo update check-all
-```
-
 __Note:__ All build command from Makefile are designed for local development purposes and hence have `SKIP_WASM_BUILD` enabled to speed up build time and use `--execution native` to only run using native execution mode.
 
 ## 4.0. Nodes