Feature/25176 bitbucket readme

[kat-kan]

Summary

This PR organizes README.md, admin-guide.md and project assets in a way described here https://github.com/mattermost/mattermost/issues/25176 I have

• reorganized files (admin guide split to separate file, assets moved to docs/images)
• updated files that use images (new directory)
• added outline to both .md files
• added missing headlines
• formatted files
• added badges to README (however, I don't have access to any code coverage report so it's empty for now)

Ticket Link

Fixes https://github.com/mattermost/mattermost/issues/25176 https://mattermost.atlassian.net/browse/MM-55077

[mattermost-build]

Hello @kat-kan,

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[kat-kan]

/check-cla

[kat-kan]

[cwarnermm]

@mickmister - Looking forward to your technical review of this PR -- particularly the image updates.

[kat-kan]

I am also looking forward to the review :)

[cwarnermm]

@kat-kan - You've done a very good job with this PR. Thank you for being so flexible and understanding about the feedback you received during @hanzei's technical review.

@hanzei - Thank you for a most excellent review! :)

[cwarnermm]

@hanzei - I believe the only check remaining is to ensure that the image assets are in the correct location.

[kat-kan]

@cwarnermm I believe they are but builds are failing after moving images because they expect specific location. I am waiting for confirmation that I should revert changes.

[kat-kan]

I reverted the changes related to images, every suggestion was introduced

[kat-kan]

@cwarnermm as we are still waiting for @hanzei to accept the changes, can you please consider adding "hacktoberfest-accepted" label? The review period in Hacktoberfest ends tomorrow and PR has to be either merged or have the label to be even considered.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (84a4030) 15.03% compared to head (29bf6d4) 15.03%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #125 +/- ## ======================================= Coverage 15.03% 15.03% ======================================= Files 13 13 Lines 2301 2301 ======================================= Hits 346 346 Misses 1936 1936 Partials 19 19 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[hanzei]

@mickmister The broken CI is unrelated to the PR. What are the next steps to getting it fixed?

[mickmister]

@hanzei I created https://github.com/mattermost/mattermost-plugin-bitbucket/pull/127 to fix the issue

[mickmister]

/update-branch

[mickmister]

@mickmister - Looking forward to your technical review of this PR -- particularly the image updates.

@cwarnermm I'm not sure there are any image updates in the PR?

[mattermost-build]

This PR has been automatically labelled "stale" because it hasn't had recent activity. A core team member will check in on the status of the PR to help with questions. Thank you for your contribution!