This change updates all references of the installer, IM, figures,
etc. to point to release FIFTEEN links.

In addition, the change includes a summary of the release and minor
changes regarding OSM installation and deprecated components.

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

# Conflicts:
#   05-osm-usage.md

feature10996-cancel_operation

See merge request !149

Update 06-osm-platform-configuration.md

See merge request !148

Feature 11002: Deprecate Helmv2

See merge request !147

Updated installation instructions for helm installation

See merge request !146

Add information about resource consumption metrics

See merge request !144

Documentation for feature 10999 Dual-Stack IP Support for VNFs in SOL003 VNFM Interface

See merge request !143

Feature 11003: AZ for Cinder

See merge request !141

Signed-off-by: aguilard <e.dah.tid@telefonica.com>

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

The script `upload_doc.sh` has been updated to allow passing a destination
folder where to upload the content to the FTP.

A new environment `test-publish`has been added to tox.ini to testing doc
publication, making use of the updates in `upload_doc.sh`

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Figures for documentation of feature 10981

See merge request !140

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Features 10981: Adoption of new monitoring architecture for closed-loops

See merge request !139

Update articles and references to osm-packages

See merge request !138

All links to packages in the FTP have been replaced by links to Gitlab
repository where all osm-packages can be found.

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Features 10937 and 10954: TAPI WIM connector and automatic WIN selection for interDC networks

See merge request !137

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Feature 10958 Audit Logs for OSM

See merge request !134

Feature 10979 Static Dual Stack Assignment

See merge request !135

Feature 8170: Add cert-manager installation as part of helm-based OSM installation

See merge request !136

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Feature 8170: Helm-based OSM installation

See merge request !133

Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

Feature 10986: Autoheal switch and Autoscale switch

See merge request !123