Remove cli examples and add link to docs page

[aguschin]

close #387

$ mlem clone --help

 Usage: mlem clone [options] uri target

 Copy a MLEM Object from `uri` and saves a copy of it to `target` path.
 Documentation: <https://mlem.ai/doc/command-reference/clone>

╭─ Arguments ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ *    uri         TEXT  URI to object you want to clone [default: None] [required]                                                                    │
│ *    target      TEXT  Path to store the downloaded object. [default: None] [required]                                                               │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
╭─ Options ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ --project              -p                TEXT  Path to MLEM project [default: (none)]                                                                │
│ --rev                                    TEXT  Repo revision to use [default: (none)]                                                                │
│ --target-project,--tp                    TEXT  Project to save target to [default: (none)]                                                           │
│ --external             -e                      Save result not in .mlem, but directly in project                                                     │
│ --index                    --no-index          Whether to index output in .mlem directory [default: no-index]                                        │
│ --help                 -h                      Show this message and exit.                                                                           │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

Look like it works (maybe need to fix tests), except for groups the link to documentation is incorrect (for mlem deploy apply it's https://mlem.ai/doc/command-reference/apply

Looking into how to fix this.

[codecov]

Codecov Report

Base: 82.31% // Head: 87.91% // Increases project coverage by +5.59% 🎉

Coverage data is based on head (355f794) compared to base (15bf4bc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.3.0     #408      +/-   ##
=================================================
+ Coverage          82.31%   87.91%   +5.59%     
=================================================
  Files                 92       92              
  Lines               7828     7839      +11     
=================================================
+ Hits                6444     6892     +448     
+ Misses              1384      947     -437     

Impacted Files	Coverage Δ
mlem/cli/apply.py	94.23% <ø> (ø)
mlem/cli/build.py	100.00% <ø> (ø)
mlem/cli/checkenv.py	100.00% <ø> (ø)
mlem/cli/clone.py	100.00% <ø> (ø)
mlem/cli/config.py	95.55% <ø> (ø)
mlem/cli/declare.py	87.27% <ø> (ø)
mlem/cli/deployment.py	89.13% <ø> (ø)
mlem/cli/dev.py	50.00% <ø> (ø)
mlem/cli/import_object.py	100.00% <ø> (ø)
mlem/cli/info.py	97.56% <ø> (ø)
... and 32 more

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[aguschin]

Finally works, except for few things that should be handled outside of this PR to enable merging this one:

1. dev find-implementations-diff for now I put a link to contributing section, but it's not a helpful one docs: help for dev find-implementations-diff mlem.ai#180
2. No reference pages for deployment wait, config (set / get), checkenv. The last two should be added in https://github.com/iterative/mlem.ai/pull/172/files as I see. deployment wait should be added to that PR as well.

[aguschin]

@mike0sv, ready for review (with the exceptions I mentioned in the last message ^). Posting couple of examples. Note, in all "Documentation" line is highlighted a bit darker than other text and than in mlem -h. Can change this, but thought it's ok to keep it not that visible.

[mike0sv]

I fixed some of the tests. Need to adopt #427 changes.
And probably mark doc links tests as xfail for now?

[aguschin]

And probably mark doc links tests as xfail for now?

Possible, but right after the update docs, we need to remove this xfail mark. Added xfail mark and mentioned this on the list of TODOs here #397