Improve SIP pages

Author: bracevac

_layouts/root-content-layout.html

@@ -20,7 +20,7 @@
           {% else %}
             <div class="supertitle">&nbsp;</div>
           {% endif %}
-          <h1>{{ page.title }}</h1>
+          <h1>{% if page.layout == 'sip' and page.number %}{{ page.kind | default: 'SIP' }}-{{ page.number }} - {% endif %}{{ page.title }}</h1>
         </div>
         <div class="search-container">
           <div class="icon-search">

_overviews/scala3-book/string-interpolation.md

@@ -367,4 +367,4 @@ expansion, executing SQL queries, magic `$"identifier"` representations, and man
 
 [java-format-docs]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Formatter.html#detail
 [value-class]: {% link _overviews/core/value-classes.md %}
-[sip-11]: {% link _sips/sips/string-interpolation.md %}
+[sip-11]: {% link _sips/sips/011-string-interpolation.md %}

_ru/scala3/book/string-interpolation.md

@@ -410,4 +410,4 @@ p"${x/5}, $x"   // Point(2.4, 12.0)
 [java-format-docs]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Formatter.html#detail
 
 [value-class]: {% link _overviews/core/value-classes.md %}
-[sip-11]: {% link _sips/sips/string-interpolation.md %}
+[sip-11]: {% link _sips/sips/011-string-interpolation.md %}

_sips/sips/named-and-default-arguments.md renamed to _sips/sips/001-named-and-default-arguments.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-1 Named and Default Arguments
-stage: completed
-status: shipped
+number: 1
 permalink: /sips/:title.html
 redirect_from: /sips/pending/named-and-default-arguments.html
+stage: completed
+status: shipped
+title: Named and Default Arguments
 ---
 
 **Lukas Rytz**

_sips/sips/scala-compiler-phase-plugin-in.md renamed to _sips/sips/002-scala-compiler-phase-plugin-in.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-2 Scala Compiler Phase and Plug-In Initialization for Scala 2.8
-stage: completed
-status: shipped
+number: 2
 permalink: /sips/:title.html
 redirect_from: /sips/pending/scala-compiler-phase-plugin-in.html
+stage: completed
+status: shipped
+title: Scala Compiler Phase and Plug-In Initialization for Scala 2.8
 ---
 
 This was an older SID that can be found [here](https://www.scala-lang.org/sid/2)

_sips/sips/new-collection-classes.md renamed to _sips/sips/003-new-collection-classes.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-3 - New Collection classes
-stage: completed
-status: shipped
+number: 3
 permalink: /sips/:title.html
 redirect_from: /sips/pending/new-collection-classes.html
+stage: completed
+status: shipped
+title: New Collection classes
 ---
 
 This was an older SID that can be found [here](https://www.scala-lang.org/sid/3)

_sips/sips/early-member-definitions.md renamed to _sips/sips/004-early-member-definitions.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-4 - Early Member Definitions
-stage: completed
-status: shipped
+number: 4
 permalink: /sips/:title.html
 redirect_from: /sips/pending/early-member-definitions.html
+stage: completed
+status: shipped
+title: Early Member Definitions
 ---
 
 This was an older SID that can be found [here](https://www.scala-lang.org/sid/4)

_sips/sips/internals-of-scala-annotations.md renamed to _sips/sips/005-internals-of-scala-annotations.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-5 - Internals of Scala Annotations
-stage: completed
-status: shipped
+number: 5
 permalink: /sips/:title.html
 redirect_from: /sips/pending/internals-of-scala-annotations.html
+stage: completed
+status: shipped
+title: Internals of Scala Annotations
 ---
 
 This was an older SID that can be found [here](https://www.scala-lang.org/sid/5)

_sips/sips/scala-2-8-arrays.md renamed to _sips/sips/007-scala-2-8-arrays.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-7 - Scala 2.8 Arrays
-stage: completed
-status: shipped
+number: 7
 permalink: /sips/:title.html
 redirect_from: /sips/pending/scala-2-8-arrays.html
+stage: completed
+status: shipped
+title: Scala 2.8 Arrays
 ---
 
 *(This is an older SID, its original PDF can be found [here](https://www.scala-lang.org/sid/7))*

_sips/sips/scala-swing-overview.md renamed to _sips/sips/008-scala-swing-overview.md

@@ -1,10 +1,12 @@
 ---
+kind: SID
 layout: sip
-title: SID-8 - Scala Swing Overview
-stage: completed
-status: shipped
+number: 8
 permalink: /sips/:title.html
 redirect_from: /sips/pending/scala-swing-overview.html
+stage: completed
+status: shipped
+title: Scala Swing Overview
 ---
 
 This was an older SID that can be found [here](https://www.scala-lang.org/sid/8)