add revision to file attributes in the browser

See merge request !12

update libcvmfs to revision 30

See merge request !11

Fix cvmfs configuration for lsst

See merge request !10

Add symlink destinations for symlinks and
"is_catalog" boolean for directories in directory listings

Add lsst.eu configuration and pubkey

See merge request !9

Display size and last modified for each file.

Add a button for showing repository counters.

Delete cvmfs-emscripten-related files and sql.js

* delete unused top-level package.json and package-lock.json
* change `npm install` to `npm ci` in Dockerfiles
* 'Cache-Controle' typo fix
* Copyright year 2019 -> 2020

Tabulated front page

See merge request !8

Install .env during docker container creation

See merge request !6

Adjust map display

See merge request !5

Install computecanada configuration in backend container

See merge request !7