The page was only linked to from the footer, now it has its own menu voice under 'Resources'

- new structure of Downloads page
- add screenshots of GUI (and make them localizable)
- add pics for hw wallets
- change structure of downloads.yml

Only use 'Blog' as a page title instead of 'Blog By Tag' and remove 'Articles by Tag'.

main:
 - [x] translated: de.yml - Status: peer-reviewed
 - [x] translated: lang\de\ - Status: peer-reviewed
 - [x] added: "de: Deutsch in other ymls"

resources:
 * untranslated: moneropedia - some terms added to match de.yml
 * untranslated: user guides
 * untranslated:  developer guides

Special thanks to ErCiccione and rodolfo912 as well as to rbrunner7

- Updated lots and lots and lots of CSS
- Changed all link colors from orange to black and underlined
- Made site more accessible across the board
- Seriously, look at all the pages and tell me it's not awesomer
- Updated relevant HTML in pages to accomodate
- Changed en.yml Developer Guides translated string to yes (why was it not already?)
- Added images to the Using Monero page for wicked sick purposes

+ Rewritten after other reading around original RingCT paper & 2017 update from Borromean to Schnorr
+ corrections after reviews

- Added upgrade snippet
- Added snippet banner to index page of all languages
- Updated yml files of all languages ready for translation
- Styling

Some people apparenly lack such common sense, but get angry at not
being told in LARGE LETTERS than having common sense is better than not.