Updated the template sample to align with the advised character limit of "80". Sample had indicated a different value and now aligns with the advice outlined: "...under 80 characters, sentence..."
- use a single document for contributing guidelines, merge CONTRIBUTING.md with PULL_REQUEST_TEMPLATE.md
- use the same formatting as https://github.com/awesome-selfhosted/awesome-selfhosted, including license and language/platform
- old entries should be updated to the new format when time allows
- the guidelies are roughly the same as for awesome-selfhosted, with the following variations:
- descriptions must be max 80 charactes long
- do not submit your own software
- write a short paragraph explaining why the software is awesome
- non-free software is not allowed
- no duplicates with awesome-selfhosted
- no list of licenses