3.17: Remove orphaned files

[jafiala]

What changes are you introducing?

Delete 6 module files that are orphaned on the 3.17 branch:

• con_boot-loader-management-and-file-structure.adoc
• ref_boot-loader-types-in-project.adoc
• ref_http-capable-boot-loaders.adoc
• ref_pxelinux-boot-loaders.adoc
• con_configuring-smart-proxy-servers-with-a-custom-ssl-certificate.adoc
• proc_running-an-ansible-playbook.adoc

These files are not included by any assembly or guide on 3.17, causing the find_unused_modules CI check to fail for all PRs targeting this branch.

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

These modules exist on master and are properly included there, but ended up on 3.17 through incomplete cherry-picks:

• The 4 boot-loader modules were touched by PR [CQA] Fix feature-centric abstracts in Provisioning Hosts #4958 (CQA abstract fixes), but their parent assembly (assembly_bootloader-binary-location.adoc, created in PR Add section "Boot loader management and file structure" #4422) was never backported to 3.17.
• proc_running-an-ansible-playbook.adoc was moved from the Ansible guide to assembly_configuring-and-setting-up-remote-jobs.adoc in PR Review Managing Configurations by using Ansible for CQA #4818, but only the removal from the Ansible guide was cherry-picked — the new include was not added to the assembly on 3.17.
• con_configuring-smart-proxy-servers-with-a-custom-ssl-certificate.adoc was created by PR Fix asciidoctor-dita-vale errors for the ConceptLink rule #4801 (ConceptLink fixes), but the corresponding include in assembly_installing-smart-proxy-server.adoc was never added on 3.17.

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

These modules remain on master where they are properly included. An alternative would have been backporting the missing assemblies and includes to 3.17, but since 3.17 is a release branch and the content was never published there, deletion is the simpler and safer approach.

Contributor checklists

• I am okay with my commits getting squashed when you merge this PR.
• I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• Foreman 3.19/Katello 4.21
• Foreman 3.18/Katello 4.20 (Satellite 6.19; orcharhino 7.9)
• Foreman 3.17/Katello 4.19
• Foreman 3.16/Katello 4.18 (Satellite 6.18; orcharhino 7.6, 7.7, and 7.8)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4; orcharhino 7.5)
• We do not accept PRs for Foreman older than 3.14.

[github-actions]

The PR preview for 17a64bd is available at theforeman-foreman-documentation-preview-pr-5153.surge.sh

The following output files are affected by this PR:

• Managing_Hosts/index-foreman-deb.html
• Managing_Hosts/index-foreman-el.html
• Managing_Hosts/index-katello.html
• Managing_Hosts/index-orcharhino.html
• Managing_Hosts/index-satellite.html

show diff

show diff as HTML

[aneta-petrova]

* `proc_running-an-ansible-playbook.adoc` was moved from the Ansible guide to `assembly_configuring-and-setting-up-remote-jobs.adoc` in PR [Review Managing Configurations by using Ansible for CQA #4818](https://github.com/theforeman/foreman-documentation/pull/4818), but only the removal from the Ansible guide was cherry-picked — the new include was not added to the assembly on 3.17.

For this file, can you please add it to Managing Hosts rather than delete it? This would be the right place:

foreman-documentation/guides/common/assembly_customizing-remote-jobs.adoc

Line 12 in 9706df6

[aneta-petrova]

* `con_configuring-smart-proxy-servers-with-a-custom-ssl-certificate.adoc` was created by PR [Fix asciidoctor-dita-vale errors for the ConceptLink rule #4801](https://github.com/theforeman/foreman-documentation/pull/4801) (ConceptLink fixes), but the corresponding include in `assembly_installing-smart-proxy-server.adoc` was never added on 3.17.

This one should be safe to delete. The only issue seems to be that because the new module from master isn't used on 3.17, the corresponding module on 3.17 still has links in the concept. I'll look into that right away in a different PR.

EDIT: #5154

[jafiala]

Thanks @aneta-petrova , restored and included.