GitLab

The structure of the roadmap isn't meant to support more than 6 tabs, so some changes are necessary to show
the roadmap correctly.

- Grouped the first 2 years 2014-215 on a single tab.
- Added headers for each card
- The last tab is now "Future", and doesn't refer to a specific year, but it's meant to show updates that will be
implemented in the future
- Changed default card from 2019 to 2020

This commits removes the page 'Technical specs' and adds some technical info to the 'About' page.
The 'technical specs' folder and page were removed from the repo, from the navigation menu and
the footer (for all languages)

zh-tw, zh-cn, tr, nl and ar are untranslated

The Urgent tag is meant to show prioritary communications that the community should be aware of as soon as possible
'Community' will show all non-urgent communications and general blog posts

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

- created tag "announcements"
- replace "Missives" with "Announcements" and linked to related tag
- moved "All Posts" at the bottom of the submenu
- add tag 'announcements' to blog posts that need it

- changed format of roadmap.yml back to UTF-8
- fixed various formatting issues in nl.yml and added missing keys
- change encoding of all user guides (nl) to UTF-8

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

Added the en translation?

Fixed the order

- BulletProofs implementation
- Kovri alpha release date

el00ruobuob authored Jun 21, 2018 and el00ruobuob committed Jun 27, 2018

+ Revuo Monero published (compressed version with www.ilovepdf.com best quality)
+ Zero to Monero published (all credit to @UkoeHB)
  - version updated on 2018-06-27
+ Mastering Monero (Preview) published (compressed version with www.ilovepdf.com best quality)
+ Readme Update

+ Corrections after test
+ localized en,fr,it,pl

Fix a typo in #575
Add early 2018
Translate early 2018 for fr/pl
Correct localization reimplementation glitches

to match Rehrar in PR #670 and #676