feat: Add docs/readme.md + update crosslinks (#6700)

* complete translate list with the new languages appeared since hacktoberfest

* Create docs/README.md with the translations section

using root README.md as source. Links are adapted to this folder

Address EbookFoundation/free-programming-books#6698

* fix remaining url + translation items

- Portuguese (Portugal)
- Slovak / slovenčina
- Slovenian / slovenščina

Address EbookFoundation/free-programming-books#6698

* fix remaining url + translation items

- Portuguese (Portugal)
- Slovak / slovenčina
- Slovenian / slovenščina

Address EbookFoundation/free-programming-books#6698

* Add inclusiveness `dare to translate...` paragraph

* Add inclusiveness `dare to translate...` paragraph

* Move translations link target url to docs

* move translation links `bs`

* move translations link `en`

* move translations crosslink `es`

* move translations crosslink `fr`

* move translations crosslink `de`

* move translations crosslink `el`

* move translations crosslink `fa_IR`

* move translations crosslink `fil`

* move translations crosslink `it`

* move translations crosslink `pt_BR`

* move translations crosslink `ko`

* move translations crosslink `ru`

* move translations crosslink `id`

* move translations crosslink `zh`

* move translations crosslink `hi`

* move translations crosslink `pl`

* move translations crosslink `uk`

* move translations crosslink `vi`

* move translations crosslink remaining `HOW-To's`

* revert feature moved to #6688

* Remove the list from the top level. Leave `en` links

* use `previous languages` in root README

* Add more languages lists in root `readme.md`

* fix typo

* fix typo

* Update docs/README.md after translations paragraph

Less text is more

Co-authored-by: Eric Hellman <eric@hellman.net>

* Update README.md after translations paragraph 

Less text is more

Co-authored-by: Eric Hellman <eric@hellman.net>

* Update README.md preface translations paragraph 

Co-authored-by: Eric Hellman <eric@hellman.net>

* fix CONTRIBUTING target url commited at fd2b39151c

* Update docs/README.md preface translations paragraph 

Co-authored-by: Eric Hellman <eric@hellman.net>

* read me! said the boss ^^,

less text is more.

Co-authored-by: Eric Hellman <eric@hellman.net>

* remove "The inclusiveness is one of our targets, so "

Co-authored-by: Eric Hellman <eric@hellman.net>

docs/HOWTO-zh_TW.md

@@ -1,4 +1,4 @@
-*[閱讀本文的其他語言版本](../README.md#translations)*
+*[閱讀本文的其他語言版本](README.md#translations)*
 
 歡迎使用 Free-Programming-Books！我們歡迎新的貢獻者；即使是在 Github 上首次提出 pull request 的人。如果您是其中之一，那麼以下資源可能會對你有所幫助：
 
@@ -15,4 +15,4 @@
 即使您是經驗豐富的開源貢獻者，也有一些事情可能會讓您遭受失敗。提交您的 PR 後，GitHub Actions 會運行程式碼品質分析工具，有時會發現間距或字母順序方面的問題。如果您獲得綠色按鈕，則說明一切準備就緒，但如果沒有，請點擊 "更多" 連結以尋找程式碼品質分析工具不满意的地方。修正此問題並新增 commit 到您的 PR。
 
 
-最後，如果不確定要添加的資源是否適合 Free-Programming-Books，請閱讀 [CONTRIBUTING](CONTRIBUTING-zh_TW.md) 中的指南。([translations](../README.md#translations))
+最後，如果不確定要添加的資源是否適合 Free-Programming-Books，請閱讀 [CONTRIBUTING](CONTRIBUTING-zh_TW.md) 中的指南。([translations](README.md#translations))