Update `$(TOP)/*.md` documents
I updated the top documents to the latest status:
-
HACKING.md
:- Modify Phabricator to GitLab infomation
- Remove old Trac information
- Add link to GitLab activity
-
MAKEHELP.md
:- Add link to hadrian wiki
- Fix markdown format
-
INSTALL.md
:- Modify boot command to remove python3
- Fix markdown format
-
README.md
:- Modify tarball file suffix
- Fix markdown format
I checked the page display on the GitHub and GitLab web.
[skip ci]