Fix navigation after #206

@gpetit @mlecoeuvre
Add description for ST_SRID
Update description for ST_SRID
Merge pull request #209 from mlecoeuvre/st_srid

Add description for St_SRID see #110
Add ST_Translate template
Add creation functions 1
Add creation functions 2
Add edit geometry templates
Add process geometry templates
Add triangulation templates
Fix ST_MakeEnvelope
Fix wrong URLS
Fix next section link
Add navigation for new function categories
Merge pull request #226 from agouge/new-fns

Add blank templates for newly added functions

Here I add blank templates for all the functions added in #80. I also add new function categories to the sidebar navigation.

TODO: Add documentation for driver functions (SHP, GEOJSON, etc.)