Controller:Api

Add:
- controller
- routes
- stats handler

Config: include info URLs

- privacy policy
- source code

cvcv.sh: usage: explain RANDID

README.md: install cvcv utility

Home: show total pastes and walls count

Search: add bar and search.html

First experimental search. Using SQL LIKE on a BYTEA. Case sensitive.
It's very bad.)

cvcv.sh: support fetching pastes

cvcv.sh: add -l option

cvcv.sh: add -P option

Add shell utility: cvcv

paste.controller.go: 400 on bad RandID length

view.html: paste stats

- number of bytes
- number of linefeeds))

view_wall.html: show pastes count

Use goview for template rendering

Gin multitemplate was giving me an headache.
Goview makes it easy to reuse "partials".

Now the RandID length is selected with a select input.

Little restyling.

Lower the min RandId length to 4

Charset of 30 elements gives 810000 IDs.

paste.controller.go: handle .txt extention

Now the plain text page is returned either when the query string param
`raw` has value `y` or when the RandId has extention `.txt`.
The "raw" button now links to the txt URL.

Template: textarea: font-monospace

README.md: list communities

Templates: format dates as RFC3339

Show only first 8 chars of RandIDs

Also style with font-monospace.