docs: Add deploy to Heroku button on README and homepage

Part of #158

Author: sman591

README.md

@@ -41,6 +41,8 @@ HackathonManager makes use of a few different third-party services & Ruby gems:
 
 **[Deploy HackathonManager for your hackathon »](https://coderit.org/hackathon-manager/docs/deployment)**
 
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
+
 ## Documentation
 
 Documentation is available at https://coderit.org/hackathon-manager/

docs/deployment-heroku.md

@@ -9,7 +9,7 @@ Click the button below to start. You'll be prompted to fill out a few questions
 
 **See [Environment Variables](deployment-environment-variables.md) for all required environment variables**
 
-[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
+[![Deploy](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/codeRIT/hackathon-manager)
 
 ### Validating initial deploy
 

website/pages/en/index.js

@@ -63,6 +63,17 @@ class HomeSplash extends React.Component {
               GitHub
             </Button>
           </PromoSection>
+          <p style={{ marginTop: '2em' }}>
+            <a
+              href="https://heroku.com/deploy?template=https://github.com/codeRIT/hackathon-manager"
+              target="blank"
+            >
+              <img
+                src="https://www.herokucdn.com/deploy/button.svg"
+                alt="Deploy to Heroku"
+              />
+            </a>
+          </p>
         </div>
       </SplashContainer>
     );