Add markdown files in Learn (#14466)

* add metadata for learn

* first batch of adding metadata to md files

* second batch of adding metadata to md files

* third batch of adding metadata to md files

* test one sidebar_label

* add missing sidebar_labels

* add missing sidebar_labels to files left behind

* test, ansible doc is stubborn

* fix

* fix

* fix

* don't use questionmarks in the sidebar label

* don't use exclamation marks and symbols in the sidebar label

* fix style guide

* fixes

* fixes

109 files changed, 558 insertions, 100 deletions

diff --git a/build_external/README.md b/build_external/README.md
index d68e4d0f10..76e9cd48ec 100644
--- a/build_external/README.md
+++ b/build_external/README.md
@@ -1,7 +1,10 @@
 <!--
 title: "External build-system"
-date: 2020-03-31
 custom_edit_url: https://github.com/netdata/netdata/edit/master/build_external/README.md
+sidebar_label: "External build-system"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Developers"
 -->
 
 # External build-system
diff --git a/collectors/python.d.plugin/pandas/README.md b/collectors/python.d.plugin/pandas/README.md
index 141549478d..36430060af 100644
--- a/collectors/python.d.plugin/pandas/README.md
+++ b/collectors/python.d.plugin/pandas/README.md
@@ -1,6 +1,10 @@
 <!--
-title: "Pandas"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/python.d.plugin/pandas/README.md
+title: "Pandas Netdata Collector"
+sidebar_label: "Pandas Netdata Collector"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "References/Collectors references"
 -->
 
 # Pandas Netdata Collector
diff --git a/contrib/README.md b/contrib/README.md
index 36abd3b102..2a5e640503 100644
--- a/contrib/README.md
+++ b/contrib/README.md
@@ -1,6 +1,10 @@
 <!--
 title: "Netdata contrib"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/contrib/README.md
+sidebar_label: "Netdata contrib"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Developers"
 -->
 
 # Netdata contrib
diff --git a/contribution-guidelines.md b/contribution-guidelines.md
index f659298035..5828bfc2a6 100644
--- a/contribution-guidelines.md
+++ b/contribution-guidelines.md
@@ -685,21 +685,11 @@ Some documents, like the Ansible guide and others in the `/docs/guides` folder,
 this case, replace `/docs` with `/img/seo`, and then rebuild the remainder of the path to the document in question. End
 the path with `.png`. A member of the Netdata team will assist in creating the image when publishing the content.
 
-For example, here is the frontmatter for the guide about [deploying the Netdata Agent with
-Ansible](https://github.com/netdata/netdata/blob/master/docs/guides/deploy/ansible.md).
+For example, here is the frontmatter for the guide
+about [deploying the Netdata Agent with Ansible](https://github.com/netdata/netdata/blob/master/packaging/installer/methods/ansible.md).
 
-```markdown
-<!--
-title: Deploy Netdata with Ansible
-description: "Deploy an infrastructure monitoring solution in minutes with the Netdata Agent and Ansible. Use and customize a simple playbook for monitoring as code."
-image: /img/seo/guides/deploy/ansible.png
-custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/guides/deploy/ansible.md
--->
-
-# Deploy Netdata with Ansible
+<img width="751" alt="image" src="https://user-images.githubusercontent.com/43294513/217607958-ef0f270d-7947-4d91-a9a5-56b17b4255ee.png">
 
-...
-```
 
 Questions about frontmatter in documentation? [Ask on our community
 forum](https://community.netdata.cloud/c/blog-posts-and-articles/6).
diff --git a/database/ram/README.md b/database/ram/README.md
index 73562f0fff..b9f0531067 100644
--- a/database/ram/README.md
+++ b/database/ram/README.md
@@ -2,6 +2,10 @@
 title: "RAM database modes"
 description: "Netdata's RAM database modes."
 custom_edit_url: https://github.com/netdata/netdata/edit/master/database/ram/README.md
+sidebar_label: "RAM database modes"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Developers/Database"
 -->
 
 # RAM modes
\ No newline at end of file
diff --git a/docs/Add-more-charts-to-netdata.md b/docs/Add-more-charts-to-netdata.md
index 35a89fba07..b1530431e8 100644
--- a/docs/Add-more-charts-to-netdata.md
+++ b/docs/Add-more-charts-to-netdata.md
@@ -1,6 +1,10 @@
 <!--
 title: "Add more charts to Netdata"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/Add-more-charts-to-netdata.md
+sidebar_label: "Add more charts to Netdata"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Possible old, not wanted documents"
 -->
 
 # Add more charts to Netdata
diff --git a/docs/Demo-Sites.md b/docs/Demo-Sites.md
index 5c4d1018fd..95448f9439 100644
--- a/docs/Demo-Sites.md
+++ b/docs/Demo-Sites.md
@@ -2,6 +2,10 @@
 title: "Demo sites"
 date: 2020-03-26
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/Demo-Sites.md
+sidebar_label: "Demo sites"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Possible old, not wanted documents"
 -->
 
 # Demo sites
diff --git a/docs/Donations-netdata-has-received.md b/docs/Donations-netdata-has-received.md
index a8623c5dbf..c7fd6f21aa 100644
--- a/docs/Donations-netdata-has-received.md
+++ b/docs/Donations-netdata-has-received.md
@@ -1,6 +1,10 @@
 <!--
 title: "Donations"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/Donations-netdata-has-received.md
+sidebar_label: "Donations"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Possible old, not wanted documents"
 -->
 
 # Donations
diff --git a/docs/README.md b/docs/README.md
index e3b9156176..8b59289170 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,6 +1,10 @@
 <!--
 title: "Read documentation on <https://learn.netdata.cloud>"
 custom_edit_url: https://github.com/netdata/netdata/edit/master/docs/README.md
+sidebar_label: "Old welcome to Documentation message doc"
+learn_status: "Published"
+learn_topic_type: "References"
+learn_rel_path: "Possible old, not wanted documents"
 -->
 
 # Read documentation on <https://learn.netdata.cloud>
diff --git a/do