Move milestone directory under Project-Description-and-Plans

[MikeOpenHWGroup]

As discussed in #592 this PR moves moves the milestones directory under Project-Description-and-Plans. It also removes the redundant cv32e40p directory under milestones/CV32E40P/Reports. The new directory structure is shown below:

programs
   └── Project-Description-and-Plans
           └── milestones
                    ├── README.md
                    ├── templates
                    └── CV32E40P
                             ├── README.md
                             ├── Reports
                             │       ├── 2020-11-02
                             │       ├── 2020-11-12
                             │       ├── 2020-11-17
                             │       ├── 2020-11-19
                             │       ├── 2020-11-23
                             │       ├── 2020-11-24
                             │       ├── 2020-12-15
                             │       ├── index.html
                             │       └── Waivers
                             └── RTL_Freeze_v1.0.0
                                     ├── DesignChecklist.md
                                     ├── ...other_checklists.md
                                     └── Verification_openissues.md

[DBees]

@MikeOpenHWGroup thanks. I apologize for not being clear. I think it is best if milestone data for each core is grouped directly under it's own folder. For example the cv32e40p milestone data would go https://github.com/openhwgroup/programs/tree/master/Project-Descriptions-and-Plans/CV32E40P/Milestone-data/(all the data) In that way all the gate documents and milestone data for each core is in one spot.

[MikeOpenHWGroup]

the cv32e40p milestone data would go to Project-Descriptions-and-Plans/CV32E40P/Milestone-data/

Done!

[MikeOpenHWGroup]

Updated directory structure.

programs
   └── Project-Description-and-Plans
           └── CV2E40Pv1
                   └── Milestone-data
                           ├── README.md
                           ├── templates
                           └── CV32E40P
                                   ├── README.md
                                   ├── Reports
                                   │       ├── 2020-11-02
                                   │       ├── 2020-etc....
                                   │       ├── index.html
                                   │       └── Waivers
                                   └── RTL_Freeze_v1.0.0
                                            ├── DesignChecklist.md
                                            ├── ...other_checklists.md
                                            └── Verification_openissues.md