[R-package] Add R logo (fixes #3331, #3332) (#3336)

* [R-package] add R package logo

* more changes

* add logo in the place CRAN expects

* revert unnecessary Rbuildignore stuff

* uploaded hex logo for R-package in SVG format (#3340)

* remove duplicate logo and fix CI

* use SVG instead of PNG

Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

R-package/README.md

@@ -1,5 +1,6 @@
-LightGBM R-package
-==================
+# LightGBM R-package
+
+<img src="man/figures/logo.svg" align="right" alt="" width="175" />
 
 ### Contents
 

R-package/man/figures/logo.svg

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docs/logo/LightGBM-logo-hex.svg

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