homepage: brings bkgd-image back + fixes footer

* re-introduces background image (addresses #344)
* removes extra height from footer for fullscreen view (addresses #346)
templates: fix "Release" string removal

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: primary dataset EOS file descriptions

* Adds EOS file index descriptions for CMS Primary Dataset record
  files.  (closes #190)

* Amends CMS Primary Datasets template to show file descriptions
  accordingly.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
ALICE: new derived datasets and analysis modules

* Adds ALICE derived datasets and ALICE analysis modules
  records.  (closes #207)

* NOTE This commit adds basic metadata only; record descriptions will
  need further refinements.

* Renames ALICE collections to `ALICE Derived Datasets` and `ALICE
  Tools` for consistency with other experiments.

* Amends ALICE templates to display record description, record files,
  and external URLs.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
CMS: fix FFT link for CMS Validate Runs record

* Fixes FFT link for CMS Validated Runs record to point to JSON file
  itself, not to GitHub splash page.  (addresses #308)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
UI: introduces "CMS VM Validation Report" page

* (closes #347)
homepage: updated bgnd + image

* lighter lines with small opacity
* (addresses #344)
UI: fixes footer overflow

* (closes #346)
news: eliminate hashtags

* (closes #285)
UI: updated click-able "App" area

* updates clickable “app” images  on “For Education” and “For Research”
pages (closes #359)
* fixes case spelling (addresses #357)
UI: home page link case spelling

* (closes #357)
UI: modifies for lhs-alignment across site

* (closes #274)
ALICE: separation of ALICE Reconstructed Data

* Separates ESD records into a new `ALICE Reconstructed Data`
  collection.  VSD record stays in the `ALICE Derived Datasets`
  collection.  (addresses #353)

* Amends record templates accordingly.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
templates: removal of "Similar records" links

* Removes "Similar records" links on search results pages.
  (closes #302)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>