Port the tables and trees sections of the tskit tut

Place some in getting_started, most in data_structures, and some in analysing_trees

Author: hyanwong

_config.yml

@@ -33,6 +33,7 @@ sphinx:
         tskit: ["https://tskit.dev/tskit/docs/stable", null]
         msprime: ["https://tskit.dev/msprime/docs/stable", null]
         pyslim: ["https://pyslim.readthedocs.io/en/stable", null]
+        numpy: ["https://numpy.org/doc/stable/", null]
       myst_enable_extensions:
       - colon_fence
       - deflist

_toc.yml

@@ -12,6 +12,10 @@ parts:
   - file: simplification
   - file: metadata
   - file: tskitr
+- caption: Analysis
+  chapters:
+  - file: analysing_tree_sequences
+  - file: analysing_trees
 - caption: Backward time simulations
   # TODO this will be broken down more finely as we add more content
   chapters: