Add GPSPoint type for starting_point
to make mypy life easier
Template: add map in index with starting points
this diff is a mess. The editor has it's ideas about how code
should be formatted, which are different than mine.
Add `jstr` template filter
`jstr` convert the input value to json and mark it as safe markup
Add `starting_point` to `Entry`
`starting_point` is the first point of the first track of the gpx file
Rebuild cached entries if template is newer
Config: fix and update ignore support
- ignore as a set
- support `.gitignore` and `.pytrekignore` files
- fix loading ad config load
- add suppor for ignore files in source dirs
Fix entry html rebuild logic
Entry html must be rebuild every time one of its 'source' change,
gpx file and images.
Templates: add meta, opengraph, twitter
Template: add 'pytrek' global and 'now' var
Fix templates, log messages
Update readme
add `config.dist.yml` example config file