docs: update readme for e2e-tests (#799)

* docs: update readme for e2e-tests

* Update e2e-tests/README.md

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

e2e-tests/README.md

@@ -1,30 +1,22 @@
 ## Summary
 
-This is a helper library for Sidecar to run runtime tests against specific chains, at certain blocks. 
+This is a helper library for Sidecar to run e2e tests against specific chains, at certain blocks. 
 
 ## Testing
 
-The below instructions are specific to runtime-tests against one chain. 
-If you are looking to run the runtime-tests against all 3 chains (Polkadot, Kusama, Westend) then run `yarn test:init-runtime-tests` in 
+The below instructions are specific to running the e2e-tests against one chain. 
+If you are looking to run the e2e-tests against all chains (Polkadot, Kusama, Westend, Statemine) then run `yarn test:init-e2e-tests` in 
 the root directory of sidecar.
 
 ### Polkadot 
 
-Lets first get sidecar ready in a seperate terminal.
+To run the tests against a single chain, you may use the following below. For more examples, reference the `<ROOT>/package.json`
 
-```
-$ cd substrate-api-sidecar
-$ git checkout <your_branch>
-$ export SAS_SUBSTRATE_WS_URL=<network archive node>
-$ yarn
-$ yarn build && yarn start
-```
+`yarn test:init-e2e-tests:polkadot`
 
-Sidecar should now be connected to the node and running successfully. If you find a bug file an issue [here](https://github.com/paritytech/substrate-api-sidecar/issues).
+That's it! 
+All the tests should come back with green checkmarks. If you find a bug file an issue [here](https://github.com/paritytech/substrate-api-sidecar/issues).
 
-Now lets run our runtime tests against polkadot. Go to a separate terminal and run:
+### Config
 
-`yarn test:runtime-tests --chain polkadot`
-
-Thats it! 
-All the tests should come back with green checkmarks.
+If you are looking to update the e2e-tests config, the file to do so exists in `<ROOT>/scripts/config.ts`.