Docs: update Windows install instructions
Docs: update Windows install instructions

- updated the instructions to account for Windows 10 path editor
- linked to third-party editors for pre-10 Windows
- separated instructions for technical and non-technical users changed
D drive paths to C drive since D is the default optical drive on most
Windows systems
- cut the assumption about 64-bit Windows since 32-bit binary is also available
- cut the assumption about command line since we're giving GUI instructions
to non-technical users
- cut a bug in the doc where we had people typing D: at the command prompt
*after* submitting `cd D:\Hugo\Sites.` Recommend snipping 386 and AMD from
ZIP file names, since they don't add useful info and will just confuse novices.

mdhender/hugo,fedelibre/hugo,tubo028/hugo,anthonyfok/hugo,gohugoio/hugo,gohugoio/hugo,vbatoufflet/hugo,jygastaud/hugo,digitalcraftsman/hugo,mitchchn/hugo,gohugoio/hugo,abourget/hugo,ffrizzo/hugo,melo/hugo,mdhender/hugo,vbatoufflet/hugo,bogem/hugo,melo/hugo,mayah/hugo,mayah/hugo,fedelibre/hugo,mdhender/hugo,mdhender/hugo,digitalcraftsman/hugo,soundrussian/hugo,Zenithar/hugo,fedelibre/hugo,Zenithar/hugo,anthonyfok/hugo,bogem/hugo,ffrizzo/hugo,tischda/hugo,tischda/hugo,soundrussian/hugo,mitchchn/hugo,jygastaud/hugo,tubo028/hugo,abourget/hugo,MarkDBlackwell/hugo,fedelibre/hugo,anthonyfok/hugo,MarkDBlackwell/hugo