website: Make latest release (1.7) be default manual (#3130)

Fixes issue with confusion about features that has not been
released yet.

Move deveopment manual.yml to dev/manual.yml
Symlink manual.yml to v1.7/manual.yml
Refactor to share history header with links to other manual versions.
Change man.test and man page generation to use dev/manual.yml

Related to #3078 #3127

docs/content/manual/manual.yml

@@ -0,0 +1 @@
+v1.7/manual.yml

docs/content/manual/v1.3/manual.yml

@@ -1,11 +1,6 @@
 ---
 headline: jq 1.3 Manual
 
-history: |
-
-  *The manual for the development version of jq can be found
-  [here](../).*
-
 body: |
 
   A jq program is a "filter": it takes an input, and produces an

docs/content/manual/v1.4/manual.yml

@@ -1,11 +1,6 @@
 ---
 headline: jq 1.4 Manual
 
-history: |
-
-  *The manual for the development version of jq can be found
-  [here](../).*
-
 body: |
 
   A jq program is a "filter": it takes an input, and produces an

docs/content/manual/v1.5/manual.yml

@@ -1,11 +1,6 @@
 ---
 headline: jq 1.5 Manual
 
-history: |
-
-  *The manual for the development version of jq can be found
-  [here](../).*
-
 body: |
 
   A jq program is a "filter": it takes an input, and produces an

docs/content/manual/v1.6/manual.yml

@@ -1,11 +1,6 @@
 ---
 headline: jq 1.6 Manual
 
-history: |
-
-  *The manual for the development version of jq can be found
-  [here](../).*
-
 body: |
 
   A jq program is a "filter": it takes an input, and produces an

docs/content/manual/v1.7/manual.yml

@@ -1,11 +1,6 @@
 ---
 headline: jq 1.7 Manual
 
-history: |
-
-  *The manual for the development version of jq can be found
-  [here](../).*
-
 body: |
 
   A jq program is a "filter": it takes an input, and produces an