Remove all HKD/satshkd support, add all EU languages

- Removed all references to HKD and satshkd from codebase
- Updated README, package.json, documentation to focus on EUR/sats
- Removed HKD-specific files (convert_btcticker.js, archive/hkd_historical)
- Updated all titles from SatsHKD/HKDSAT to SatsEUR/EURSAT
- Removed HKD image reference from sats.hbs
- Updated Python scripts to use 'historical' instead of 'hkd_historical'
- Added all 16 missing EU official languages with translations:
  * Bulgarian (bg), Croatian (hr), Czech (cs), Danish (da)
  * Estonian (et), Finnish (fi), Greek (el), Hungarian (hu)
  * Irish (ga), Latvian (lv), Lithuanian (lt), Maltese (mt)
  * Romanian (ro), Slovak (sk), Slovenian (sl), Swedish (sv)
- Now supports all 24 EU official languages

README.md

@@ -1,4 +1,4 @@
-## HKDSAT Historical Chart
+## EURSAT Historical Chart
 
 for entertainment and educational purposes only.
 
@@ -8,13 +8,13 @@ bitfinex daily close data: https://www.investing.com/crypto/bitcoin/btc-usd-hist
 
 cronjob is on github actions, see action.yml
 
-### Install 
+### Install
 
-- use at least node 22+ 
+- use at least node 22+
 
 ```
-https://github.com/bitkarrot/satshkd-vercel.git
-cd satshkd-vercel 
+git clone <repository-url>
+cd <repository-directory>
 npm install
 node index.js
 ```