[release-1.4] HACDOCS-975: Adding JFrog Artifactory plugin content

[openshift-cherrypick-robot]

This is an automated cherry-pick of #714

/assign Gerry-Forde

[rhdh-bot]

Preview: https://redhat-developer.github.io/red-hat-developers-documentation-rhdh/pr-866/

[Gerry-Forde]

@missmesss Olga, the JFrog docs are now published for RHDH 1.4 - thanks for all your work on this content.

[Gerry-Forde]

/cherrypick main

[openshift-cherrypick-robot]

@Gerry-Forde: #866 failed to apply on top of branch "main":

Applying: adding artifactory plugin content
.git/rebase-apply/patch:119: trailing whitespace.
* You have enabled the JFrog Artifactory plugin. 
warning: 1 line adds whitespace errors.
Using index info to reconstruct a base tree...
M	assemblies/dynamic-plugins/assembly-configuring-rhdh-plugins.adoc
M	assemblies/dynamic-plugins/assembly-using-rhdh-plugins.adoc
Falling back to patching base and 3-way merge...
Auto-merging assemblies/dynamic-plugins/assembly-configuring-rhdh-plugins.adoc
CONFLICT (add/add): Merge conflict in artifacts/rhdh-plugins-reference/jfrog-artifactory/jfrog-artifactory-plugin-user.adoc
Auto-merging artifacts/rhdh-plugins-reference/jfrog-artifactory/jfrog-artifactory-plugin-user.adoc
CONFLICT (add/add): Merge conflict in artifacts/rhdh-plugins-reference/jfrog-artifactory/jfrog-artifactory-plugin-admin.adoc
Auto-merging artifacts/rhdh-plugins-reference/jfrog-artifactory/jfrog-artifactory-plugin-admin.adoc
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 adding artifactory plugin content

In response to this:

/cherrypick main

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