fix:Add links heading to ToC (#63)

# Details

Problem outlined in: #62

Link header is added to `toc` table, however this happens after the
ToC is rendered so it is effectively ignored.

Change rendering order so links are added before the ToC.

Updated a unit test case to catch this.

Author: MeanderingProgrammer

scripts/panvimdoc.lua

@@ -200,8 +200,8 @@ Writer.Pandoc = function(doc, opts)
   DATE = doc.meta.date
   TITLE_DATE_PATTERN = doc.meta.titledatepattern
   local d = blocks(doc.blocks)
-  local toc = renderToc()
   local notes = renderNotes()
+  local toc = renderToc()
   local title = renderTitle()
   local footer = renderFooter()
   return { title, layout.blankline, toc, d, notes, layout.blankline, footer }

test/toc.jl

@@ -6,6 +6,8 @@
 
     # TLDR
 
+    ![caption](image.png)
+
     ## Summary 1
     ## Summary 2
 
@@ -27,6 +29,7 @@ Table of Contents                                     *test-table-of-contents*
   - Summary 2                                                 |test-summary-2|
 3. Motivation                                                |test-motivation|
 4. References                                                |test-references|
+5. Links                                                          |test-links|
 
 ==============================================================================
 1. panvimdoc                                                  *test-panvimdoc*
@@ -49,6 +52,11 @@ SUMMARY 2                                                     *test-summary-2*
 ==============================================================================
 4. References                                                *test-references*
 
+==============================================================================
+5. Links                                                          *test-links*
+
+1. *caption*: image.png
+
 Generated by panvimdoc <https://github.com/kdheepak/panvimdoc>
 
 vim:tw=78:ts=8:noet:ft=help:norl:
@@ -60,6 +68,8 @@ vim:tw=78:ts=8:noet:ft=help:norl:
 
     # TLDR
 
+    ![caption](image.png)
+
     ## Summary 1
     ## Summary 2
 
@@ -93,6 +103,11 @@ SUMMARY 2                                                     *test-summary-2*
 ==============================================================================
 4. References                                                *test-references*
 
+==============================================================================
+5. Links                                                          *test-links*
+
+1. *caption*: image.png
+
 Generated by panvimdoc <https://github.com/kdheepak/panvimdoc>
 
 vim:tw=78:ts=8:noet:ft=help:norl: