Host MultiQC HTML files

### Context

We are using [MultiQC](http://multiqc.info) to generate QC reports for the RNA-seq pipeline (#205). MultiQC generates HTML files (example [here](https://github.com/AlexsLemonade/refinebio/issues/187#issuecomment-379735105)). During this week's tech team meeting, the question of hosting these HTML files came up.

### Problem or idea

The idea behind hosting these files is that this will facilitate users ability quickly view the report, perhaps obviating the need to download the files alongside their expression data & sample metadata. It may also be helpful information during the data discovery and selection process -- i.e., a user may want to know about per sequence quality scores prior to adding a sample to their dataset.

### Solution or next step

We should investigate this further from both implementation and user experience angles after Keytar Kurt.

### Related

Relevant QC tools are discussed here: #203, #205

### New Issue Checklist

- [x] The title is short and descriptive.
- [x] You have explained the context that led you to write this issue.
- [x] You have reported a problem or idea.
- [x] You have proposed a solution or next step.

Start by reviewing the MultiQC context in issues #205 and #203, along with the example report linked from issue #187. Determine the implementation and user-experience requirements for hosting these HTML reports; done should be a decided, actionable approach rather than an open-ended investigation.

Written by the indexing model from the issue text.