Update 0200-12-30-introduction.md

Links for first two images were missing. Fixed links.
Update 0200-12-26-gps-1.md

3 missing images. Links fixed.
Merge branch 'emirhartato-gh-pages' into gh-pages
Merge pull request #215 from sylviahc/patch-1

Update 0200-12-30-introduction.md
Merge pull request #216 from sylviahc/patch-2

Update 0200-12-26-gps-1.md