html/lesson1: small indentation change

Had a student (legitimately) ask why this part wasn't intended like the others.
Merge pull request #91 from passy/patch-1

html/lesson1: small indentation change
JQuery -> jQuery
Merge pull request #93 from passy/jquery-rename

JQuery -> jQuery
update title
Fixing the URLs pointing to the images used in HTML lesson 1
Merge pull request #95 from ollie101/gh-pages

Fixing the URLs pointing to the images used in HTML lesson 1
Proposes some updates to JS lessons 1 and 2.
Code review updates.