Update moneropedia node entry with "network upgrades" instead of "hardfork" and month to "October" and "April" Instead of "September" and "March"

+ correction on Italian Account
+ Removed leftover miners.md (replaced by mining.md)
+ Removed Dust and update Copyright
+ Code improvement to avoid reading the config file and to use the builtin jekyll config variable passed in the content
+ Ammount.md:25/26 glitch "\@transaction-privacy" corrected. PL to be checked twice.
+ Italian ammount.md moneropedia links corrected (terms added to destination entries, unnecessary markdown links removed)
+ Polish corrections
+ extend ruby \word-boundary in regex to match `-based` `-like` `-form`
+ Updated readme according to the new way to add or translate a moneropedia entry
+ fix mining with CryptoNight variant
+ rebased to include AR
+ chery picked #820 to avoid conflicts

Corrected a typo "s/offline, offline,/offline,/"

- Updated README to accomodate for changes
- Updated footer and roadmap for multi-lingual readiness
- Updated yml files for an 'untranslated' string
- Added an 'untranslated' snippet to all untranslated files
- Added a 'template' language for new languages to be made easily
- Added link to Monerujo site to Downloads page
- CSS updates