Rename Religious/Ideological Icons

[Xenomorph99]

I believe we decided to use literal not representational names for icons in our library. If this is true, then the following icons need to be renamed.

• christianity --> cross or crucifix We have shield-cross and shield-cross-outline, which motivates us to rename christianity and christianity-outline to cross and cross-outline. However, crucifix and crucifix-outline would work too, but then we'd probably want shield-crucifix and shield-crucifix-outline to match. https://en.wikipedia.org/wiki/Crucifix

• islam --> star-crescent _https://en.wikipedia.org/wiki/Star_and_crescent_ aliases: islam, religion-islam, religion-muslim

• judaism --> star-david _https://en.wikipedia.org/wiki/Star_of_David_ aliases: judaism, religion-judaism, religion-judaic, jewish, hebrew, israel, magen-david

• buddhism --> dharmachakra https://en.wikipedia.org/wiki/Dharmachakra aliases: dharma-wheel, religion-hinduism, religion-buddhism, religion-jainism

• hinduism --> om https://en.wikipedia.org/wiki/Om aliases: aum, religion-hinduism, religion-buddhism, religion-jainism

[mririgoyen]

These have been renamed.