[WIP] Overhaul the documentation site (#1030)

Overhaul the whole documentation site

docs/posts/demo-data.md

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+---
+layout: default
+title: demo-data
+description: Demo datasets
+---
+
+# Example datasets
+**To use these datasets, run:**  
+`cellxgene launch [filename.h5ad] --open`
+
+### Peripheral blood mononuclear cells
+Healthy human PBMCs (10X).
+
+- Source: [10X genomics](https://support.10xgenomics.com/single-cell-gene-expression/datasets/1.1.0/pbmc3k)
+- Cells: 2,638
+- File size: 19MB
+- [Raw data](http://cf.10xgenomics.com/samples/cell-exp/1.1.0/pbmc3k/pbmc3k_filtered_gene_bc_matrices.tar.gz)
+- [Processing](https://github.com/chanzuckerberg/cellxgene-vignettes/blob/master/dataset-processing/pbmc3k-processing.ipynb)
+- Launch:   
+```
+cellxgene launch https://cellxgene-example-data.czi.technology/pbmc3k.h5ad
+```
+
+### Tabula muris
+20 organs and tissues from healthy mice (Smart-Seq2).  
+Rich metadata and annotations.
+
+- Source: [bioRxiv, CZBiohub](https://www.biorxiv.org/content/10.1101/237446v2)
+- Cells: 45,423
+- File size: 174MB
+- [Raw data](https://figshare.com/projects/Tabula_Muris_Transcriptomic_characterization_of_20_organs_and_tissues_from_Mus_musculus_at_single_cell_resolution/27733)
+- [Processing](https://github.com/chanzuckerberg/cellxgene-vignettes/blob/master/dataset-processing/tabula-muris-processing.ipynb)
+- Launch:
+```
+cellxgene launch https://cellxgene-example-data.czi.technology/tabula-muris.h5ad
+```
+
+### Tabula muris senis
+22 organs and tissues from healthy mice at ages 3mo, 18mo, 21mo, and 24mo (Smart-Seq2).  
+Rich metadata and annotations.
+
+- Source: [bioRxiv, CZBiohub](https://www.biorxiv.org/content/10.1101/661728v1)
+- Cells: 81,478
+- File size: 3.9GB
+- Raw data [geo link coming soon!]
+- [Processing](https://www.biorxiv.org/content/10.1101/661728v1)
+- Launch:
+```
+cellxgene launch https://cellxgene-example-data.czi.technology/tabula-muris-senis.h5ad
+```