fixed bad link

link did not link to wikipedia article. moved link to best guess of intended file

Add text to "Disadvantages of microkernels"

Add link to Forum

Add link to image

make sure we cite source and license

Fixed small typos

Fixed: Removed compiling section with extra commands

Added cd to cloning script

Edit side projects page

Use maintainers instead of BFDL

You asked for nitpicking, so here I go :). BFDL should only be used for
large projects that have been around for a while and have an established
leader who no one could every see changing. The side projects are likely
to have their maintainers change and are not so large as to warrant
calling anyone a BFDL.

Update welcome.md

You took some wiki content so I am taking some credit: :-P

Add languages to relevant fenced code blocks

Grammar, spelling, punctuation, and typo fixes

See http://azerupi.github.io/mdBook/format/theme/syntax-highlighting.html