[Doxygen] Layout adjustments (#6196)

* Layout adjustments.

Took 1 hour 54 minutes

Took 2 minutes


Took 6 minutes

* Remove the empty building page.

Took 7 minutes

* Change to @page

Took 11 minutes

* Change to @page again

Took 52 seconds

* Change to @page again again

Took 2 minutes

* Fence the page declaration in CONTRIBUTING.md

Took 8 minutes

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

Doxyfile

@@ -48,7 +48,7 @@ PROJECT_NAME           = "Cockatrice"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         =
+PROJECT_NUMBER         = 2.11
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewers a
@@ -61,13 +61,13 @@ PROJECT_BRIEF          =
 # pixels and the maximum width should not exceed 200 pixels. Doxygen will copy
 # the logo to the output directory.
 
-PROJECT_LOGO           =
+PROJECT_LOGO           = cockatrice/resources/cockatrice.png
 
 # With the PROJECT_ICON tag one can specify an icon that is included in the tabs
 # when the HTML document is shown. Doxygen will copy the logo to the output
 # directory.
 
-PROJECT_ICON           =
+PROJECT_ICON           = cockatrice/resources/cockatrice.png
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute) path
 # into which the generated documentation will be written. If a relative path is
@@ -839,7 +839,7 @@ FILE_VERSION_FILTER    =
 # DoxygenLayout.xml, Doxygen will parse it automatically even if the LAYOUT_FILE
 # tag is left empty.
 
-LAYOUT_FILE            =
+LAYOUT_FILE            = DoxygenLayout.xml
 
 # The CITE_BIB_FILES tag can be used to specify one or more bib files containing
 # the reference definitions. This must be a list of .bib files. The .bib
@@ -991,7 +991,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = cockatrice common
+INPUT                  = .github/CONTRIBUTING.md cockatrice common doc/doxygen-extra-pages
 
 # This tag can be used to specify the character encoding of the source files
 # that Doxygen parses. Internally Doxygen uses the UTF-8 encoding. Doxygen uses
@@ -1749,7 +1749,7 @@ ECLIPSE_DOC_ID         = org.doxygen.Project
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-DISABLE_INDEX          = NO
+DISABLE_INDEX          = YES
 
 # The GENERATE_TREEVIEW tag is used to specify whether a tree-like index
 # structure should be generated to display hierarchical information. If the tag