Remove section about modifying build files in contributing.md.

Author: Inhishonor

CONTRIBUTING.md

@@ -41,43 +41,5 @@ To update the wiki, simply navigate to the [wiki tab](https://github.com/octoshr
 6. Submit a pull request with your change.
 **We have a build action on each pull request, if this build fails, please edit the pull request in order to make the build succeed.**
 ## Helpful Tips
-### [build.gradle](https://github.com/octoshrimpy/quik/blob/master/presentation/build.gradle) configuration for building locally
-```
-
-/*
-    signingConfigs {
-        release {
-            def keystoreProps = new Properties()
-            def keystorePropsFile = rootProject.file('./.gradle/.gradlerc')
-            storeFile file('./my-release-key.keystore')
-            keyAlias 'quik_release'
-            if (keystorePropsFile.exists()) {
-                keystoreProps.load(new FileInputStream(keystorePropsFile))
-            } else if (System.getenv("CI") == "true") {
-//                do nothing
-            } else {
-                throw new GradleException("Keystore properties file not found.")
-            }
-            storePassword keystoreProps['storePassword']
-            keyPassword keystoreProps['keyPassword']
-        }
-    }
-*/
-    buildTypes {
-        release {
-            minifyEnabled true
-            shrinkResources true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-       //     signingConfig signingConfigs.release
-        }
-    }
-
-    productFlavors {
-        withAnalytics { dimension "analytics" }
-        noAnalytics {
-        //    signingConfig signingConfigs.release
-        }
-    }
-```
 ### Set Java Version
 When building QUIK, make sure to download JDK 17 and specify an installation path for it. In Android Studio, you can do that in Settings > Build, Execution, Deployment > Build Tools > Gradle.