add benchmark component and route, refs steemit#2269

This commit adds a page at /benchmark that wrk or similar can be pointed
at. When condenser is run with the appropriate offline SSR flag no
external calls will be made and therefore an accurate picture of SSR CPU
usage bottlenecks can be made before and after any changes.

README.md

@@ -167,28 +167,6 @@ cd src/db
 yarn exec sequelize db:migrate
 ```
 
-#### Install Tarantool - Production Only
-
-Tarantool similarly to mysql is not required for development but if you're running a full-fledged site with condenser you will want to run one.
-
-OS X:
-
-```bash
-brew install tarantool
-```
-
-Debian based Linux:
-
-```bash
-sudo apt-get install tarantool
-```
-
-Test the interactive console:
-
-```bash
-user@example:~$ tarantool
-```
-
 #### Style Guides For Submitting Pull Requests
 
 ##### File naming and location
@@ -199,10 +177,8 @@ user@example:~$ tarantool
 - Component's stylesheet file name should match component name
 
 ##### Js & Jsx
-We are using _[Airbnb JavaScript Style Guide](https://github.com/airbnb/javascript)_ with some modifications (see .eslintrc).
-Please run _eslint_ in the working directory before committing your changes and make sure you didn't introduce any new styling issues.
 
-We use prettier to autofromat the code. Run `yarn run fmt` to format everything in `src/`, or `yarn exec -- prettier --config .prettierrc --write src/whatever/file.js` for a specific file.
+We use [prettier](https://github.com/prettier/prettier) to autofromat the code, with [this configuration](.prettierrc). Run `yarn run fmt` to format everything in `src/`, or `yarn exec -- prettier --config .prettierrc --write src/whatever/file.js` for a specific file.
 
 ##### CSS & SCSS
 If a component requires a css rule, please use its uppercase name for the class, e.g. "Header" class for the header's root div.
@@ -219,6 +195,25 @@ We adhere to BEM methodology with exception for Foundation classes, here is an e
 </ul>
 ```
 
+## Testing
+
+### Run test suite
+
+`yarn test`
+
+will run `jest`
+
+### Test endpoints offline
+
+If you want to test a server-side rendered page without using the network, do this:
+
+```
+yarn build
+OFFLINE_SSR_TEST=true SDC_DATABASE_URL="mysql://[email protected]/steemit_dev" NODE_ENV=production node --prof lib/server/index.js
+```
+
+This will read data from the blobs in `api_mockdata` directory. If you want to use another set of mock data, create a similar directory to that one and add an argument `OFFLINE_SSR_TEST_DATA_DIR` pointing to your new directory.
+
 ## Issues
 
 To report a non-critical issue, please file an issue on this GitHub project.