Report-config.json: Support more fields

[Boon-Jun]

We have added a report-config.json file that can be used for the configuration of report generation. Right now, it only allows users to specify a report title.

We can support more fields with this config file, especially if they can be applied to all repositories during report generation. The following are some of the fields I think we can include:

• [ ] sinceDate
• [ ] untilDate
• [ ] timeZone
• [ ] introductory text?(see discussion below)

[dcshzj]

We can also extend it to configure the introductory text as outlined in #467.

[Boon-Jun]

I think we have to decide to what extent should we allow the customization of the introductory text. If its just basic text replacement, then it can be done, but if the users are allowed to modify the html themselves, then it might not be suitable

[fzdy1914]

@damithc Hi, Prof. Do you think a simple text will do what you need?

[damithc]

I think it would be support basic HTML but if that's too hard, even just text is good enough. We also need to figure out where we are going to display that text, in what format.

[dcshzj]

Related task for setting sinceDate and untilDate: #634