zeppelin/notebook
1ambda 7e045728e0 [ZEPPELIN-2025] Cleanup R Tutorial
### What is this PR for?

1. Remove useless paragraphs in R tutorial
2. Prettify layout

I attached screenshots for comparison. See the screenshot section below.

### What type of PR is it?
[Improvement]

### Todos

Done

### What is the Jira issue?

[ZEPPELIN-2025](https://issues.apache.org/jira/browse/ZEPPELIN-2025)

### How should this be tested?

1. Run Zeppelin
2. See the R tutorial

### Screenshots (if appropriate)

#### Before

![before](https://cloud.githubusercontent.com/assets/4968473/22393959/5266c76a-e556-11e6-8501-34d87c31908e.gif)

#### After

![after](https://cloud.githubusercontent.com/assets/4968473/22393961/5394bc50-e556-11e6-83f8-23ccaa05c12a.gif)

### Questions:
* Does the licenses files need update? - NO
* Is there breaking changes for older versions? - NO
* Does this needs documentation? - NO

Author: 1ambda <1amb4a@gmail.com>

Closes #1955 from 1ambda/ZEPPELIN-2025/cleanup-r-tutorial and squashes the following commits:

20d551e [1ambda] fix: Prettify layout in medium size
178178e [1ambda] fix: Cleanup R Tutorial
2017-01-31 15:56:47 +09:00
..
2A94M5J1Z [BugFix] Tutorial note json format. 2016-12-23 12:54:19 +09:00
2BWJFTXKJ [ZEPPELIN-2025] Cleanup R Tutorial 2017-01-31 15:56:47 +09:00
2BYEZ5EVK [BugFix] Tutorial note json format. 2016-12-23 12:54:19 +09:00
2C2AUG798 [BugFix] Tutorial note json format. 2016-12-23 12:54:19 +09:00
2C35YU814 [ZEPPELIN-1787] Add an example of Flink Notebook 2017-01-12 12:06:01 +09:00
2C57UKYWR ZEPPELIN-1985 Remove user from pig tutorial note 2017-01-22 14:59:58 +09:00