add support ejs files

[flockast]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce?

The ability to use .ejs

• What is the current behavior?

We can use only .html files

• What is the new behavior (if this is a feature change)?

EJS have a lot of features in templates and this changes allow us to use it

• Does this PR introduce a breaking change?

No it doesn't, everything works as before

• Other information:

[doodirock]

Was just about to ask if templates were possible. Would really complete the project to have support for templates. Any plans on a merge?

[pnikolov]

@flockast @doodirock I've resolved all merge conflicts and will approve this PR - adding support for .ejs files.
In order for adding a full support of .ejs template files do you think that adding ejs package as dependency and its configuration would be useful?