Add docs for installing from source and from pkgs
Add docs for installing from source and from pkgs

Signed-off-by: Deepak Giridharagopal <d11186354d1ef01ca06ae37d7e23e827da13e85f@puppetlabs.com>

puppetlabs/puppetdb,mullr/puppetdb,highb/puppetdb,grimradical/puppetdb,johnduarte/puppetdb,github/puppetlabs-puppetdb,melissa/puppetdb,highb/puppetdb,grimradical/puppetdb,grimradical/puppetdb,jantman/puppetdb,rbrw/puppetdb,kbrezina/puppetdb,wkalt/puppetdb,wkalt/puppetdb,johnduarte/puppetdb,ajroetker/puppetdb,haus/puppetdb,ajroetker/puppetdb,rbrw/puppetdb,wkalt/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,stahnma/puppetdb,senior/puppetdb,kbarber/puppetdb,github/puppetlabs-puppetdb,highb/puppetdb,waynr/puppetdb,senior/puppetdb,rbrw/puppetdb,shrug/puppetdb,kbarber/puppetdb,cprice404/puppetdb,senior/puppetdb,cprice404/puppetdb,nfagerlund/puppetdb,rbrw/puppetdb,mullr/puppetdb,melissa/puppetdb,kbrezina/puppetdb,ajroetker/puppetdb,waynr/puppetdb,kbarber/puppetdb,rbrw/puppetdb,shrug/puppetdb,grimradical/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,johnduarte/puppetdb,mullr/puppetdb,wkalt/puppetdb,shrug/puppetdb,mullr/puppetdb,jantman/puppetdb,stahnma/puppetdb,ajroetker/puppetdb,mullr/puppetdb,highb/puppetdb,waynr/puppetdb,stahnma/puppetdb,nfagerlund/puppetdb,shrug/puppetdb,senior/puppetdb,jantman/puppetdb,kbrezina/puppetdb,puppetlabs/puppetdb,johnduarte/puppetdb,haus/puppetdb,haus/puppetdb,waynr/puppetdb,github/puppetlabs-puppetdb,melissa/puppetdb,nfagerlund/puppetdb,cprice404/puppetdb,kbrezina/puppetdb