delete everything else

Fixes #45

Fixes #47

TODO: Implement caching mechanism to speed up the process

+ Change logic detecting if article was modified
Fixes #43

Fixes #27

Explicitly order all commits

This reverts commit 6a3bac13.

It wasn't working when run from different directory than one it was
stored in

And update it to work in correct directory

Configuration option (config.toml):

[git]
mergeMessage = "array or string"

Fixes #38

Example usage:

node query.js --sql "select metadata.tags as tags, metadata.title as title where count(metadata.tags) == 1 and contains(metadata.tags, 'Článek');"

prints list of articles which have only tag "Článek" - usefull for
listing not yet tagged articles

Implements #26

if path contains "git". Should be if contains ".git"

Fix hamburger menu position. Fixes #12
Smaller headings. Fixes #13

Fixes CI builds

fixes #34

simple test = just compile example site

1. More robust href parameter parsing
2. Split youtube-related code (except html) to separate file
3. Unit tests for 1 and 2
4. Heading "Hello - world" now generates "hello-world" anchor instead of
   "hello---world" (no more duplicated hyphens in urls)

1. Not building without build/theme directory (race condition)
2. Wrong defaults for contentdir
3. Other bugs caused by those. Fixes #32 and #33