Announce DataHub's participation in Hacktoberfest (datahub-project#1927)

* Announce DataHub's participation in Hacktoberfest

* Move the hactoberfest content around

* Add quality standards of PR for hacktoberfest

* Update README.md

Co-authored-by: Mars Lan <[email protected]>

docs: add external link (datahub-project#1828)

* Update README.md

* Update links.md

feat(kubernetes): Improve the security of the kubernetes/helm charts (d…

…atahub-project#1782)

* 1747 | remove obsolete yaml files

* 1747 | remove configmap and its hardcoded references

* 1747 | add missing input parameter of neo4j.host

* 1747 | remove obsolete secrets and parameterize the rest

* 1747 | auto-generate gms secret

* 1747 | remove fullName overrides

* 1747 | fix parameters in subchart's values.yaml

* 1747 | remove hardcoding from parameters for gms host and port

* 1747 | upgrade chart version

* 1747 | update helm docs

* 1747 | add extraEnv, extraVolume and extraMounts

* 1747 | Alters pull policy of images to 'always' for ldh

Co-authored-by: shakti-garg <[email protected]>

docs: add a sequence diagram and a description (datahub-project#1757)

* add a sequence diagram and a description

* update descrpition based on feedback

* Update README.md

* Update README.md

Co-authored-by: Mars Lan <[email protected]>

[fix] load default picture link if not present (datahub-project#1709)

Use v0.4 for datahub docker images as part of quickstart

Use v0.3.1 for datahub docker images

Use v0.3 for datahub docker images as part of quickstart

Remove unused dataset models

Add more samples to bootstrap data to be able to show upstreams/downs…

…treams support