Add include for the "Further reading" section

* I added an include and use this include for the installation guides that already had this section
* I added the "Further reading" section as well as te "Questions" section to the English guides that didn't have it yet
* I added a first point "How Federation Works/Why is my Federated Timeline empty?" to link to lains blogpost about this because we still get this question a lot in the #pleroma support channel
* I reordered the list a bit

docs/installation/alpine_linux_en.md

@@ -225,10 +225,7 @@ sudo -Hu pleroma MIX_ENV=prod mix pleroma.user new <username> <your@emailaddress
 
 #### Further reading
 
-* [Backup your instance](../administration/backup.md)
+{! backend/installation/further_reading.include !}
-* [Hardening your instance](../configuration/hardening.md)
-* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)
 
 ## Questions
 

docs/installation/arch_linux_en.md

@@ -200,10 +200,7 @@ sudo -Hu pleroma MIX_ENV=prod mix pleroma.user new <username> <your@emailaddress
 
 #### Further reading
 
-* [Backup your instance](../administration/backup.md)
+{! backend/installation/further_reading.include !}
-* [Hardening your instance](../configuration/hardening.md)
-* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)
 
 ## Questions
 

docs/installation/debian_based_en.md

@@ -186,10 +186,7 @@ sudo -Hu pleroma MIX_ENV=prod mix pleroma.user new <username> <your@emailaddress
 
 #### Further reading
 
-* [Backup your instance](../administration/backup.md)
+{! backend/installation/further_reading.include !}
-* [Hardening your instance](../configuration/hardening.md)
-* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)
 
 ## Questions
 

docs/installation/debian_based_jp.md

@@ -175,10 +175,7 @@ sudo -Hu pleroma MIX_ENV=prod mix pleroma.user new <username> <your@emailaddress
 
 #### その他の設定とカスタマイズ
 
-* [Backup your instance](../administration/backup.md)
+{! backend/installation/further_reading.include !}
-* [Hardening your instance](../configuration/hardening.md)
-* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)
 
 ## 質問ある？
 

docs/installation/further_reading.include

@@ -0,0 +1,5 @@
+* [How Federation Works/Why is my Federated Timeline empty?](https://blog.soykaf.com/post/how-federation-works/)
+* [Backup your instance](../administration/backup.md)
+* [Updating your instance](../administration/updating.md)
+* [Hardening your instance](../configuration/hardening.md)
+* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)

docs/installation/gentoo_en.md

@@ -283,10 +283,7 @@ If you opted to allow sudo for the `pleroma` user but would like to remove the a
 
 #### Further reading
 
-* [Backup your instance](../administration/backup.md)
+{! backend/installation/further_reading.include !}
-* [Hardening your instance](../configuration/hardening.md)
-* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)
 
 ## Questions
 

docs/installation/netbsd_en.md

@@ -196,3 +196,11 @@ incorrect timestamps. You should have ntpd running.
 ## Instances running NetBSD
 
 * <https://catgirl.science>
+
+#### Further reading
+
+{! backend/installation/further_reading.include !}
+
+## Questions
+
+Questions about the installation or didn’t it work as it should be, ask in [#pleroma:matrix.org](https://matrix.heldscal.la/#/room/#freenode_#pleroma:matrix.org) or IRC Channel **#pleroma** on **Freenode**.

docs/installation/openbsd_en.md

@@ -242,3 +242,11 @@ If your instance is up and running, you can create your first user with administ
 ```
 LC_ALL=en_US.UTF-8 MIX_ENV=prod mix pleroma.user new <username> <your@emailaddress> --admin
 ```
+
+#### Further reading
+
+{! backend/installation/further_reading.include !}
+
+## Questions
+
+Questions about the installation or didn’t it work as it should be, ask in [#pleroma:matrix.org](https://matrix.heldscal.la/#/room/#freenode_#pleroma:matrix.org) or IRC Channel **#pleroma** on **Freenode**.

docs/installation/otp_en.md

@@ -270,10 +270,7 @@ This will create an account withe the username of 'joeuser' with the email addre
 
 ## Further reading
 
-* [Backup your instance](../administration/backup.md)
+{! backend/installation/further_reading.include !}
-* [Hardening your instance](../configuration/hardening.md)
-* [How to activate mediaproxy](../configuration/howto_mediaproxy.md)
-* [Updating your instance](../administration/updating.md)
 
 ## Questions