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prep version

Merge pull request ColorlibHQ#2189 from REJack/v3-dev

fixed placehold.it link

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prep version

- changes version to 2.4.13
- updated package.json
- updated build/less/AdminLTE.less & AdminLTE-without-plugins.less
- rebuilt dist files
- updated version in demo pages

Merge pull request ColorlibHQ#2141 from REJack/v3-dev

last fixes before releasing v3.0.0-beta.1

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updated README.md

- changed github links to ColorlibHQ
- removed Donations part

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