Update qemu instructions

See merge request Librem5/developer.puri.sm!421

Update Flashing_eMMC.rst for changes in librem-flash-image behaviour

See merge request Librem5/developer.puri.sm!420

Update libhandy git repo and demo name

Closes #172

See merge request Librem5/developer.puri.sm!419

It's now sm.puri.Handy.Demo

Update more libhandy links

See merge request Librem5/developer.puri.sm!417

Update libhandy links

See merge request Librem5/developer.puri.sm!416

Resolve "Please link to phosh's develpoment docs"

Closes #170

See merge request Librem5/developer.puri.sm!413

Adjust markup and style, fix file name mentioned

See merge request Librem5/developer.puri.sm!412

Add different image tags for diffierent librem5 verison

See merge request Librem5/developer.puri.sm!410

Reflashing the phone: Update the command to flash a new image

See merge request Librem5/developer.puri.sm!411

Resolve "packaging and publishing details hidden below Getting in Touch"

Closes #160

See merge request Librem5/developer.puri.sm!407

Remove obsolete text about the red LED

See merge request Librem5/developer.puri.sm!409

Resolve "broken link on API Documentation page"

Closes #163

See merge request Librem5/developer.puri.sm!406

Update outdated references to Q3 2019

See merge request Librem5/developer.puri.sm!405

Resolve "deprecte zanata"

Closes #159

See merge request Librem5/developer.puri.sm!404

Updates to "System Images" page

See merge request !403

Update software stack

See merge request !402

"plain" is what we use for our production images. Right now those
two types are mutually exclusive (image kinds that offer "plain"
don't offer "current" and vice versa), so let's mention both to avoid
confusion.

Add information about LED APIs

See merge request !401

Remove content width restriction

See merge request Librem5/developer.puri.sm!389