Merge pull request #32 from mjasion/master

added newsletter page + all three newsletters
newsletter 4
+ pagination on old newsletters
newsletter-4 link to topic on wjug group
Fixed link to koduj.com
Merge pull request #33 from nurkiewicz/patch-1

Fixed link to koduj.com
Add info about meeting 143
Fix some minor issues after adding meeting 143
removed WJUG-JCP section
added JDD logo
scheduled Thymeleaf presentation
updated schedule
Thymeleaf presentation is sponsored by 4finance
scheduled next meeting
Warsjawa case studies meeting details
removed library section
added links to slides from Warsjawa case study meeting
scheduled Docker workshop