Is it permissible to design a 100% Islamic website, and what can it include to ensure the preservation of its content from piracy or alteration, and is this work rewarded with good deeds?

The idea of designing an Islamic website is a successful and much-needed one. Fear of hacking should not prevent this, and if hacking occurs, there is no sin upon you. You can include everything that is beneficial and useful for Muslims, such as the Holy Quran and its recitations, and lessons from trusted scholars.