Edx URL's are broken

[luccaflower]

Edx changed their website structure, so now a bunch of (all?) links to non-archived edx courses are broken.

[luccaflower]

https://www.edx.org/course/modeling-and-theory -> https://www.edx.org/learn/databases/stanford-university-databases-modeling-and-theory
https://www.edx.org/course/databases-5-sql -> https://www.edx.org/learn/relational-databases/stanford-university-databases-relational-databases-and-sql
https://www.edx.org/course/semistructured-data -> https://www.edx.org/learn/relational-databases/stanford-university-databases-semistructured-data

[luccaflower]

https://www.edx.org/course/how-to-code-simple-data -> https://www.edx.org/learn/coding/university-of-british-columbia-how-to-code-simple-data
https://www.edx.org/course/how-to-code-complex-data -> https://www.edx.org/learn/coding/university-of-british-columbia-how-to-code-complex-data
https://www.edx.org/course/cybersecurity-fundamentals -> ?
https://www.edx.org/course/computer-graphics-2 -> ?
https://www.edx.org/course/compilers -> https://www.edx.org/learn/computer-science/stanford-university-compilers
https://www.edx.org/course/computational-geometry -> https://www.edx.org/learn/geometry/tsinghua-university-ji-suan-ji-he-computational-geometry
https://www.edx.org/course/web-security-fundamentals -> https://www.edx.org/learn/computer-security/ku-leuven-web-security-fundamentals
https://www.edx.org/course/secure-software-development-requirements-design-and-reuse -> https://www.edx.org/learn/software-development/the-linux-foundation-secure-software-development-requirements-design-and-reuse
https://www.edx.org/course/secure-software-development-implementation -> https://www.edx.org/learn/software-development/the-linux-foundation-secure-software-development-implementation
https://www.edx.org/course/secure-software-development-verification-and-more-specialized-topics -> https://www.edx.org/learn/software-engineering/the-linux-foundation-secure-software-development-verification-and-more-specialized-topics

[pulkitkrishna00]

https://www.edx.org/course/cybersecurity-fundamentals ->https://www.edx.org/learn/cybersecurity/rochester-institute-of-technology-cybersecurity-fundamentals
https://www.edx.org/course/computer-graphics-2 -> https://www.edx.org/learn/computer-graphics/the-university-of-california-san-diego-computer-graphics

[pulkitkrishna00]

There are also links to Edx courses in extra courses page, so keeping this issue open for now.

[pulkitkrishna00]

fixed by #1342 and #1343